{"id":107796,"date":"2025-04-28T11:10:09","date_gmt":"2025-04-28T09:10:09","guid":{"rendered":"https:\/\/staging.xometry.pro\/articles\/injection-molding-defects\/"},"modified":"2025-09-29T11:16:40","modified_gmt":"2025-09-29T09:16:40","slug":"injection-molding-defects","status":"publish","type":"articles","link":"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-defects\/","title":{"rendered":"15 Common Injection Molding Defects: Types, Causes, and Solutions"},"content":{"rendered":"<div role=\"navigation\" aria-label=\"Table of Contents\" class=\"simpletoc wp-block-simpletoc-toc\"><h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#h-quick-reference-defect-comparison-table-nbsp\">Quick-Reference Defect Comparison Table&nbsp;<\/a>\n<\/li>\n<li><a href=\"#h-1-short-shots\">#1 Short Shots<\/a>\n<\/li>\n<li><a href=\"#h-2-flash\">#2 Flash<\/a>\n<\/li>\n<li><a href=\"#h-3-improper-parting-line-placement\">#3 Improper Parting Line Placement<\/a>\n<\/li>\n<li><a href=\"#h-4-bubbles-and-voids\">#4 Bubbles and Voids<\/a>\n<\/li>\n<li><a href=\"#h-5-gate-vestige\">#5 Gate Vestige<\/a>\n<\/li>\n<li><a href=\"#h-6-flow-lines\">#6 Flow Lines<\/a>\n<\/li>\n<li><a href=\"#h-7-burn-marks\">#7 Burn Marks<\/a>\n<\/li>\n<li><a href=\"#h-8-sink-marks\">#8 Sink Marks<\/a>\n<\/li>\n<li><a href=\"#h-9-surface-delamination\">#9 Surface Delamination<\/a>\n<\/li>\n<li><a href=\"#h-10-weld-lines-knit-lines\">#10 Weld Lines (Knit Lines)<\/a>\n<\/li>\n<li><a href=\"#h-11-warping\">#11 Warping<\/a>\n<\/li>\n<li><a href=\"#h-12-jetting\">#12 Jetting<\/a>\n<\/li>\n<li><a href=\"#h-13-vacuum-voids\">#13 Vacuum Voids<\/a>\n<\/li>\n<li><a href=\"#h-14-discoloration\">#14 Discoloration<\/a>\n<\/li>\n<li><a href=\"#h-15-splay-marks-silver-streaking\">#15 Splay Marks (Silver Streaking)<\/a>\n<\/li>\n<li><a href=\"#causes-of-contamination-in-injection-molding-and-how-to-prevent-them\">Causes of Contamination in Injection Molding and How to Prevent Them<\/a>\n<\/li>\n<li><a href=\"#h-injection-molding-defects-by-severity-and-cost-impact\">Injection Molding Defects by Severity and Cost Impact<\/a>\n<\/li>\n<li><a href=\"#prevent-injection-molding-defects-with-xometry\">Prevent Injection Molding Defects with Xometry<\/a>\n<\/li><\/ul><\/div>\n\n\n<p class=\"wp-block-paragraph\">By applying best practices in design, mold engineering, and process control, these defects are largely predictable and avoidable. This article identifies common injection molding defects, examines their underlying reasons, and offers practical solutions to help you achieve consistently high-quality molded parts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-quick-reference-defect-comparison-table-nbsp\"><strong>Quick-Reference Defect Comparison Table <\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below summarizes the various injection molding defect types and highlights their causes and possible solution or prevention methods. More details are provided in the next section.<\/p>\n\n\n<div class=\"custom-table-block table-with-white-space\" id=\"table-id-311\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-311\" placeholder=\"Table search\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 25%;\"><strong>Injection Molding Defect<\/strong><\/td>\n<td style=\"width: 25%;\"><strong>Description<\/strong><\/td>\n<td style=\"width: 25%;\"><strong>Causes<\/strong><\/td>\n<td style=\"width: 25%;\"><strong>Prevention\/Solution<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Flow Lines<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Visible as streaks or lines on the surfaces of molded parts. <\/span><span style=\"font-weight: 400;\">The lines are often of different color or shade compared to the rest of the material<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Inappropriate injection speed, pressure, and temperature<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 Too small runner and gates<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Monitor and adjust injection speed, pressure, and temperature accordingly<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 Increase runner and gate sizes<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Burn Marks<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Appears as yellow or black marks at the end of the flow<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 High injection speed and\/or pressure<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Insufficient venting in the mold<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Dirty vents<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Monitor and adjust injection temperature accordingly<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Check and clean restricted vents and air traps<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Clean all molding surfaces and parting lines<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Sink Marks<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Visible as depressions or indentions on the surface of molded parts. <\/span><span style=\"font-weight: 400;\">Often occurs in thicker areas where outer layers rapidly cool and solidify before inner layers do.<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Inappropriate selection of plastic material<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 Improper mold design<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Unideal cooling temperature<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 High injection speed or pressure<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Proper Material selection<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Better mold design<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Using appropriate cooling temperature<br \/>\n<span style=\"font-weight: 400;\">\u2022 <\/span><\/span><span style=\"font-weight: 400;\">Using appropriate injection speed or pressure<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Surface Delamination<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Peeling of the upper layer of the molded part, which exposes layers beneath.\u00a0<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Inappropriate handling or storage of plastic material<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 Wrong choice of plastic materials<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Poorly maintained equipment<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Proper material handling and storage<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Proper material selection<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Proper maintenance of equipment<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Weld Lines (Knit Lines)<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Incomplete bonding of two mold fronts of molten plastic meet and solidify. <\/span><span style=\"font-weight: 400;\">Lines are visible on the surface of the molded parts.<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Inadequate mold design<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Inappropriate cooling temperature<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 High injection speed or pressure<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Proper mold design<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Monitor and adjust cooling temperature accordingly<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Use the right injection pressure<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Flash<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Shows up as thin layers of plastic that escape from the mold cavity. <\/span><span style=\"font-weight: 400;\">Are usually visible along the parting line, ejector pins, and gate areas.<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Excess supply of materials<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Poorly maintained tools and equipment<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Inappropriate mold set up<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Low injection pressure<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Use appropriate shot size<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Proper maintenance of tools and equipment<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Monitor and adjust injection pressure accordingly<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Redesigning the mold<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Short Shots<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">An incomplete part resulting from shortage of plastic material. <\/span><span style=\"font-weight: 400;\">Cavities are left on the molded part.\u00a0<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Inadequate molding material<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Low injection pressure and pressure<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Inappropriate mold venting<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Optimize mold design to match material flow<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Adjust temperature and pressure accordingly<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Use molding equipment with optimized short size<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Gate Vestige<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Small plastic protrusions or remnants left on parts at gate locations after molding<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Improper gate design<br \/>\n\u2022 Excessive gate size<br \/>\n\u2022 Incorrect trimming<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Redesign gate geometry<br \/>\n\u2022 Optimize gate dimensions<br \/>\n\u2022 Implement automated trimming<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Improper Parting Line Placement<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Misaligned or incorrectly positioned parting lines causing flash, aesthetic, or dimensional issues<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Poor mold design<br \/>\n\u2022 Incorrect tooling alignment<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Optimize parting line placement in mold design<br \/>\n\u2022 Improve mold alignment and tooling precision<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Warping<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">A visible distortion or bending that occurs in parts as they cool and solidify due to uneven cooling rates<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Fluctuating cooling rates<br \/>\n\u2022 <\/span><span style=\"font-family: inherit; font-size: inherit;\">Ineffective mold design<br \/>\n<span style=\"font-weight: 400;\">\u2022 <\/span><\/span><span style=\"font-weight: 400;\">Flawed selection of plastic material<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Ensure constant cooling rates<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022 Optimize mold design<br \/>\n<\/span><span style=\"font-family: inherit; font-size: inherit;\">\u2022 Use appropriate molding material<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Jetting<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Manifests as snake-like lines or streaks on the surface of the molded part<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 High injection speed and pressure<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Low mold surface temperature<br \/>\n\u2022 <\/span><span style=\"font-family: inherit; font-size: inherit;\">Gate size too small<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Monitor and adjust injection speed and pressure<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Modify the gate design<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Optimize the temperature of the mold and plastic material<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Adjust gate size<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Vacuum Voids<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Air pockets that form within the interior of a molded part. <\/span><span style=\"font-weight: 400;\">Trapped air fails to vent out of the mold cavity during molding<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Uneven cooling<br \/>\n<\/span><span style=\"font-weight: 400;\">\u2022\u00a0 Low injection speed and\/or pressure<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Air traps in the melt<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Monitor and adjust cooling temperature and pressure accordingly<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Use an appropriate injection speed<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Reduce decompression and screw RPM<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Discoloration<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Any visible discoloration on the surface of the molded parts. <\/span><span style=\"font-weight: 400;\">May indicate underlying problem within the molded parts<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Degradation of the plastic material caused by excessive heat and <\/span><span style=\"font-weight: 400;\">contamination of the material<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Improper thermal stability of colorant<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Different molds from a previous production run<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Monitor and control the temperature of the mold and the plastic material<br \/>\n\u2022 <\/span><span style=\"font-family: inherit; font-size: inherit;\">Ensure plastic material is properly dried and not contaminated<br \/>\n<span style=\"font-weight: 400;\">\u2022 <\/span><\/span><span style=\"font-weight: 400;\">Proper mixing of the masterbatch<br \/>\n\u2022 <\/span><span style=\"font-weight: 400;\">Maintain thermal stability of colorant.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Splay Marks (Silver Streaking)<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Silvery or streaky marks appearing on part surfaces, typically radiating from gate areas<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Moisture or contamination in resin<br \/>\n\u2022 High shear stress or injection speed<br \/>\n\u2022 Improper resin drying<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Ensure proper resin drying<br \/>\n\u2022Adjust injection speed and pressure<br \/>\n\u2022 Improve material handling<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 25%;\"><strong>Bubbles and Void<\/strong><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">Air pockets or cavities visible inside or near the surface of molded parts<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Poor venting<br \/>\n\u2022 Excessive moisture<br \/>\n\u2022 Rapid injection speeds<\/span><\/td>\n<td style=\"width: 25%;\"><span style=\"font-weight: 400;\">\u2022 Enhance mold venting<br \/>\n\u2022 Optimize injection parameters<br \/>\n\u2022Proper drying and storage of resins<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mold-design-related-vs-process-related-injection-molding-defects\"><strong>Mold Design-Related vs. Process-Related Injection Molding Defects<\/strong><\/h3>\n\n\n\n<h4 id=\"injection-molding-defects-caused-by-mold-design\" class=\"wp-block-heading\"><strong>Injection Molding Defects Caused By Mold Design<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Defects rooted in mold design usually emerge from improper initial tooling or inadequate mold maintenance. These often require extensive, costly, and time-consuming corrections, including significant mold modifications or complete retooling. Addressing mold-related issues through comprehensive Design for Manufacturing (DfM) analyses during the early design stage prevents costly production interruptions.<\/p>\n\n\n<section class=\"callout-block light color-style_green\">\r\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"32\" height=\"32\" viewBox=\"0 0 32 32\" fill=\"none\">\r\n              <path d=\"M16 2C8.26875 2 2 8.26875 2 16C2 23.7313 8.26875 30 16 30C23.7313 30 30 23.7313 30 16C30 8.26875 23.7313 2 16 2ZM16 27.625C9.58125 27.625 4.375 22.4188 4.375 16C4.375 9.58125 9.58125 4.375 16 4.375C22.4188 4.375 27.625 9.58125 27.625 16C27.625 22.4188 22.4188 27.625 16 27.625Z\" fill=\"#092C47\"\/>\r\n              <path d=\"M14.666 21.8335C14.666 22.2313 14.8241 22.6129 15.1054 22.8942C15.3867 23.1755 15.7682 23.3335 16.166 23.3335C16.5638 23.3335 16.9454 23.1755 17.2267 22.8942C17.508 22.6129 17.666 22.2313 17.666 21.8335C17.666 21.4357 17.508 21.0541 17.2267 20.7728C16.9454 20.4915 16.5638 20.3335 16.166 20.3335C15.7682 20.3335 15.3867 20.4915 15.1054 20.7728C14.8241 21.0541 14.666 21.4357 14.666 21.8335ZM15.416 18.3335H16.916C17.0535 18.3335 17.166 18.221 17.166 18.0835V9.5835C17.166 9.446 17.0535 9.3335 16.916 9.3335H15.416C15.2785 9.3335 15.166 9.446 15.166 9.5835V18.0835C15.166 18.221 15.2785 18.3335 15.416 18.3335Z\" fill=\"#092C47\"\/>\r\n            <\/svg>        <p>Test text<\/p>\n<\/section>\n\n    <aside class=\"article-content-aside\">\r\n        <a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-design-tips\/\" class=\"aside-image sidebar__aside-image\"><img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2023\/12\/injection-moulding-draft-angles-1440x584-1.webp\" alt=\"\"><\/a><a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-design-tips\/\" class=\"aside-link\">Design Tips for Injection Molding<\/a>    <\/aside>\r\n    \n\n\n<p class=\"wp-block-paragraph\">The primary mold design-related defects include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Short Shots<\/li>\n\n\n\n<li>Flash<\/li>\n\n\n\n<li>Gate Vestige<\/li>\n\n\n\n<li>Improper Parting Line Placement<\/li>\n\n\n\n<li>Bubbles and Voids<\/li>\n<\/ul>\n\n\n\n<h4 id=\"injection-molding-defects-caused-by-process\" class=\"wp-block-heading\"><strong>Injection Molding Defects Caused By Process<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Process-related defects commonly result from improper control or incorrect settings within the molding cycle. Variables such as injection pressure, injection speed, mold\/resin temperatures, cooling rates, and material conditions significantly influence these defects. Unlike mold design issues, process-related problems often can be mitigated through adjustments in machine settings\u2014without extensive mold modifications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical process-related defects include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flow Lines<\/li>\n\n\n\n<li>Burn Marks<\/li>\n\n\n\n<li>Warping<\/li>\n\n\n\n<li>Vacuum Voids<\/li>\n\n\n\n<li>Sink Marks<\/li>\n\n\n\n<li>Weld Lines (Knit Lines)<\/li>\n\n\n\n<li>Jetting<\/li>\n\n\n\n<li>Discoloration<\/li>\n\n\n\n<li>Surface Delamination<\/li>\n\n\n\n<li>Splay Marks (Silver Streaking)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By clearly differentiating mold design-related defects from process-related defects, engineers can effectively pinpoint root causes, streamline troubleshooting, and consistently achieve optimal injection molding quality.<\/p>\n\n\n    <aside class=\"article-content-aside\">\r\n        <a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-moulding-overview\/\" class=\"aside-image sidebar__aside-image\"><img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2023\/07\/injection-moulding-parts.jpg\" alt=\"Injection molded parts\"><\/a><a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-moulding-overview\/\" class=\"aside-link\">Injection Molding Technology Overview<\/a>    <\/aside>\r\n    \n\n\n<p class=\"wp-block-paragraph\">Having established the common defects and their causes in the table above, we now turn directly to detailed, practical explorations of each defect\u2014starting with one of the most critical design-related issues:<strong> <\/strong>Short Shots.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-short-shots\"><strong>#1 Short Shots<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <em>short shot<\/em> is a severe injection molding defect that occurs when molten plastic fails to completely fill the mold cavity, resulting in incomplete or malformed parts. These parts are structurally unsound and usually discarded or reprocessed, leading to wasted material, time, and resources.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Short shots are often the result of poor flow characteristics\u2014either due to restrictive mold designs, material viscosity issues, or suboptimal injection parameters. Inadequate venting or air traps can also block the material flow, preventing the cavity from filling properly.<\/p>\n\n\n    <aside class=\"article-content-aside\">\r\n        <a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-materials\/\" class=\"aside-image sidebar__aside-image\"><img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2023\/12\/Mix-Plastic-pellets.webp\" alt=\"Mix Plastic pellets\"><\/a><a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-materials\/\" class=\"aside-link\">Injection Molding Materials: Comprehensive Overview<\/a>    <\/aside>\r\n    \n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"488\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots-1024x488.png\" alt=\"Short shots in Injection Molding\" class=\"wp-image-107712\" style=\"max-width:800px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots-1024x488.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots-300x143.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots-768x366.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots-1536x732.png 1536w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots.png 1562w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots.png\" data-fancybox=\"gallery-107796\" data-caption=\"Short shots in Injection Molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Short-shots.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Short shots in Injection Molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Narrow or blocked gates<\/strong>: Redesign gates to allow smoother material flow into the cavity.<\/li>\n\n\n\n<li><strong>Low injection speed or pressure<\/strong>: Increase both to ensure the material reaches every section of the mold.<\/li>\n\n\n\n<li><strong>Low mold or melt temperature<\/strong>: Adjust temperatures to maintain optimal resin flow during injection.<\/li>\n\n\n\n<li><strong>Poor venting<\/strong>: Improve mold venting to allow trapped air to escape, reducing resistance in hard-to-reach areas.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: For parts with thin walls or intricate features, selecting low-viscosity resins can help ensure better flow into complex geometries and reduce the risk of short shots.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-flash\"><strong>#2 Flash<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Flash, also known as spew, is a designer defect that manifests as thin layers of excess material at the edges of molded parts. It commonly appears along parting lines, ejector pin locations, or near gates\u2014where molten plastic escapes into the gaps between mold components. Minor flashes can be trimmed, but extensive flash may render parts unusable, especially in high-precision or cosmetic applications.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"535\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash-1024x535.png\" alt=\"Example of flash defect in injection molding\" class=\"wp-image-107652\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash-1024x535.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash-300x157.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash-768x401.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash-1536x802.png 1536w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash.png 1582w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of flash defect in injection molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Flash.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of flash defect in injection molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Poor mold design or wear on mold surfaces: <\/strong>redesign the mold or refurbish sealing surfaces<\/li>\n\n\n\n<li><strong>Low clamping force: <\/strong>increase clamping pressure to prevent mold separation during injection<\/li>\n\n\n\n<li><strong>Excessive injection pressure: <\/strong>reduce pressure to avoid forcing material into unwanted gaps<\/li>\n\n\n\n<li><strong>High mold temperature:<\/strong> lower the temperature to improve sealing between mold halves<\/li>\n\n\n\n<li><strong>Improper mold alignment or setup:<\/strong> check mold fit and ensure proper plate alignment<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Use simulation tools to validate pressure balance and optimize clamping force before production.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-improper-parting-line-placement\"><strong>#3 Improper Parting Line Placement<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A parting line is where two mold halves (core and cavity) meet. Incorrectly placing or aligning this line can lead to flash, visible seams, or additional finishing steps\u2014especially if it crosses critical part features.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>Key Causes &amp; Solutions:<\/strong><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inadequate mold design or misalignment:<\/strong> Ensure precise alignment with robust mold clamps, alignment pins, and well-planned parting surfaces.<\/li>\n\n\n\n<li><strong>Excessive complexity at the parting boundary:<\/strong> Simplify part geometry or split the design logically so critical features don\u2019t straddle the parting line.<\/li>\n\n\n\n<li><strong>Aesthetic considerations:<\/strong> Whenever possible, place parting lines along less visible edges or surfaces to minimize their visual impact.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: During design, use CAD-based parting line analysis tools to pinpoint optimal placement. This approach reduces finishing time and prevents flash.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-bubbles-and-voids\"><strong>#4 Bubbles and Voids<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bubbles and voids appear as trapped air pockets in or near the surface of injection-molded parts. Bubbles typically occur close to the part\u2019s exterior, while voids form internally\u2014often in thicker cross-sections. Both can weaken structural integrity, compromise dimensional accuracy, and affect final appearance.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"456\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles-1024x456.png\" alt=\"Example of bubbles and voids\" class=\"wp-image-107616\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles-1024x456.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles-300x134.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles-768x342.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles.png 1450w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of bubbles and voids\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Bubbles.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of bubbles and voids<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>Key Causes &amp; Solutions:<\/strong><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inadequate mold venting:<\/strong> Improve or add vent channels to let air escape during filling.<\/li>\n\n\n\n<li><strong>Uneven or rapid injection speeds:<\/strong> Slow down the injection process and ensure consistent speeds to minimize entrapped air.<\/li>\n\n\n\n<li><strong>Excessive moisture or contaminants:<\/strong> Thoroughly dry resins and keep equipment clean to prevent moisture-induced bubbles.<\/li>\n\n\n\n<li><strong>Material flow imbalances:<\/strong> Adjust gate design or cavity layout to promote uniform flow and reduce localized air pockets.<\/li>\n\n\n\n<li><strong>Thick sections: <\/strong>Aim for uniform part thickness or add ribs\/bosses instead of solid blocks; apply balanced cooling channels to maintain even temperatures.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Use mold flow simulations to identify potential air-trap zones and optimize gate placement, venting, and resin flow paths before production begins.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-gate-vestige\"><strong>#5<\/strong> <strong>Gate Vestige<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gate vestige describes the small protrusion of plastic left behind once the molded part is ejected and the gate separates. If not carefully managed, it can require manual trimming or degrade the finished part\u2019s cosmetic appearance.<\/p>\n\n\n    <section class=\"article-slider-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <!-- Swiper -->\r\n            <div class=\"swiper mySwiper2 article-slider-display\">\r\n                <div class=\"swiper-wrapper\">\r\n                                                <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-1-.png\" alt=\"Example of a gate vestige in injection molding\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-1-.png\" data-fancybox=\"gallery\" data-caption=\"Example of a gate vestige in injection molding\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-1-.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"Example of a gate vestige in injection molding\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                    <p>Example of a gate vestige in injection molding<\/p>\n                                <\/div>\r\n                            <\/div>\r\n                            \r\n                                                        <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-2.png\" alt=\"Example of a gate vestige in injection molding\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-2.png\" data-fancybox=\"gallery\" data-caption=\"Example of a gate vestige in injection molding\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-2.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"Example of a gate vestige in injection molding\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                    <p>Example of a gate vestige in injection molding<\/p>\n                                <\/div>\r\n                            <\/div>\r\n                            \r\n                                            <\/div>\r\n            <\/div>\r\n            <div thumbsSlider=\"\" class=\"swiper mySwiper article-slider-list\">\r\n                <div class=\"swiper-wrapper\">\r\n                                            <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-1-.png\" alt=\"Example of a gate vestige in injection molding\">\r\n                        <\/div>\r\n                                                <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Gate-vestige-2.png\" alt=\"Example of a gate vestige in injection molding\">\r\n                        <\/div>\r\n                                        <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n    \n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Excessively large or inappropriately positioned gates: <\/strong>Adopt specialized gate designs like tunnel or sub-gate systems, ensuring the leftover plastic is automatically severed during ejection.<\/li>\n\n\n\n<li><strong>High injection pressure or extended packing times: <\/strong>Fine-tune injection speed, pressure, and pack profiles to reduce material accumulation and ensure a cleaner separation.<\/li>\n\n\n\n<li><strong>Mould disrepair, worn edges or misalignments: <\/strong>Regularly inspect mold inserts and ensure plates align perfectly to avoid inconsistent shearing at the gate.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Placing gates on a concealed surface or near part edges can mask vestiges if total elimination isn\u2019t feasible. This approach preserves aesthetics while minimizing post-mold finishing steps.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-6-flow-lines\"><strong>#6<\/strong> <strong>Flow Lines<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Flow lines are one of the most common process defects. They manifest as patterns or streaks on the surface of molded components but can also be observed as ring-shaped bands close to the mold entrances. These injection molding defects are often characterized by a different shade of color from the surrounding material.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"894\" height=\"856\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines.png\" alt=\"Example of flow lines in injection molding\" class=\"wp-image-107664\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines.png 894w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines-300x287.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines-768x735.png 768w\" sizes=\"auto, (max-width: 894px) 100vw, 894px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of flow lines in injection molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/flow-lines.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of flow lines in injection molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Inconsistent cooling rates, varying mold wall thickness, and low injection speed and pressure cause flow lines in injection molding, implying the solution involves increasing the injection speed, pressure, and resin temperature. Moving mold gates farther from the mold coolant can also help extend the material cooling time. Uniform cooling rate and mold thickness are equally crucial to eliminate flow lines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Low injection speed or pressure<\/strong>: Increase injection speed and pressure to ensure molten plastic fills the mold cavity uniformly and without premature cooling.<\/li>\n\n\n\n<li><strong>Low mold or material temperature<\/strong>: Raise the temperature of both the mold and resin to maintain adequate flow characteristics and prevent early solidification.<\/li>\n\n\n\n<li><strong>Improper gate location or small gate size<\/strong>: Relocate gates to promote smoother flow paths or increase gate size to reduce shear and hesitation during fill.<\/li>\n\n\n\n<li><strong>Inconsistent wall thickness<\/strong>: Redesign part geometry to maintain uniform wall thickness and avoid sudden transitions that disrupt flow velocity and cooling.<\/li>\n\n\n\n<li><strong>Early cooling near coolant channels<\/strong>: Position gates further from the cooling channels to delay premature cooling in critical regions of the part.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally, simulations using mold flow analysis software can help engineers optimize gate design, injection parameters, and part geometry early in the development phase\u2014reducing the likelihood of flow-related defects before production begins.<\/p>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro\u00a0Tip<\/strong>: In high-appearance parts, slightly adjusting the surface texture or applying matte finishes can help visually mask minor flow lines without compromising structural integrity.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-7-burn-marks\"><strong>#7<\/strong> <strong>Burn Marks<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Burn marks are process-related injection molding defects that appear as yellowish, brown, rusty, or black discoloration on the surface of molded parts\u2014often near the end of the flow path or around air traps. While primarily considered aesthetic flaws, in more severe cases, they may indicate localized overheating that leads to polymer degradation and even structural weakness in the affected areas.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"471\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks-1024x471.png\" alt=\"Example of a burn mark in injection molding\" class=\"wp-image-107628\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks-1024x471.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks-300x138.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks-768x353.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks.png 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of a burn mark in injection molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Burn-marks.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of a burn mark in injection molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These marks are typically the result of trapped air or gases igniting due to excessive heat and pressure. This occurs when there is insufficient venting in the mold, overly high injection speeds, or poorly designed runner systems that don&#8217;t allow air to escape efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Trapped air due to poor venting<\/strong>: Improve venting channels or add air escape vents to allow gases to exit the mold cavity safely before resin arrival.<\/li>\n\n\n\n<li><strong>Excessive injection speed or pressure<\/strong>: Reduce injection speed and pressure slightly to prevent rapid compression of air pockets that leads to overheating and ignition.<\/li>\n\n\n\n<li><strong>Excessive melt or mold temperature<\/strong>: Lower the melt temperature or optimize cycle time to avoid polymer degradation near air traps.<\/li>\n\n\n\n<li><strong>Contaminants or degraded material in the mold<\/strong>: Clean mold surfaces and avoid using degraded resin to prevent burnt residues that mimic burn marks.<\/li>\n\n\n\n<li><strong>Improper runner or gate design<\/strong>: Redesign runners and gates to ensure smooth resin flow and reduce the chance of air entrapment in dead zones.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Utilizing mold flow simulation tools during the design phase can help predict and eliminate areas where gas traps are likely to form. These simulations can guide better vent placement and flow path optimization, reducing the chance of burn marks from the outset.<\/p>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: If burn marks consistently appear in the same area of a part, consider relocating the gate or modifying the flow path to avoid trapping air in that region\u2014this simple design adjustment can significantly reduce thermal buildup and eliminate burn-related discoloration.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-8-sink-marks\"><strong>#8<\/strong> <strong>Sink Marks<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sink marks in injection molding appear as small depressions, dents, or shallow craters on the surface of the molded parts. These imperfections typically occur in areas with thick wall sections where the outer layers of the part cool and solidify faster than the internal material, which continues to shrink as it cools. While primarily a cosmetic issue, severe sink marks can also affect the dimensional accuracy and mechanical performance of the part.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"434\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark-1024x434.png\" alt=\"Example of sink marks in injection molding\" class=\"wp-image-107724\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark-1024x434.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark-300x127.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark-768x326.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark.png 1368w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of sink marks in injection molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/sink-mark.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of sink marks in injection molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sink marks are generally caused by inadequate packing pressure, excessively thick wall designs, insufficient cooling, or high temperatures at the gate. Fortunately, these defects can be addressed both during the design phase and through process optimization.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Excessive wall thickness<\/strong>: Optimize part design by maintaining uniform wall thickness and using ribs or hollow structures to reduce bulk volume.<\/li>\n\n\n\n<li><strong>Inadequate packing pressure<\/strong>: Increase packing pressure and hold time to ensure sufficient material is pushed into thicker areas during cooling.<\/li>\n\n\n\n<li><strong>Short cooling cycle<\/strong>: Extend cooling time and ensure even mold cooling to allow inner layers to solidify fully.<\/li>\n\n\n\n<li><strong>Gate temperature too high<\/strong>: Lower gate temperature or reposition the gate to improve flow and reduce localized overheating.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Use mold temperature control units (TCUs) to ensure uniform and consistent cooling across the mold, especially near thicker features prone to shrinkage.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-9-surface-delamination\"><strong>#9<\/strong> <strong>Surface Delamination<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Surface delamination is a cosmetic and structural injection molding defect where thin layers of the part peel or flake off, resembling separation or blistering on the surface. This usually results from foreign substances\u2014such as mold release agents, moisture, or incompatible materials\u2014being introduced into the plastic melt. These contaminants interfere with molecular bonding, resulting in weak surface adhesion and layered peeling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While delamination may not always impact mechanical performance, it significantly affects appearance and can be a sign of deeper processing issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material contamination<\/strong>: Clean hoppers, dryers, and tooling thoroughly before processing; avoid mixing incompatible plastics.<\/li>\n\n\n\n<li><strong>Excessive or incompatible release agents<\/strong>: Minimize the use of release agents and ensure they&#8217;re suitable for the plastic type in use.<\/li>\n\n\n\n<li><strong>High moisture content in resin<\/strong>: Dry hygroscopic materials (like ABS, PC, or PA) according to recommended drying times and temperatures.<\/li>\n\n\n\n<li><strong>Improper melt temperature or shear<\/strong>: Excessive shearing or low melt temps can worsen delamination\u2014maintain optimized processing conditions.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Use inline material dryers and closed material delivery systems to minimize airborne contaminants and ensure resin stays dry before entering the barrel.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-10-weld-lines-knit-lines\"><strong>#10<\/strong> <strong>Weld Lines (Knit Lines)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weld lines\u2014also known as knit lines or meld lines\u2014occur when two or more flow fronts of molten plastic meet but fail to fuse properly during the injection process. This leads to a visible line or seam on the part surface, often appearing as a fine hairline or faint discoloration. More critically, the interface between the flow fronts tends to be mechanically weaker, reducing the part\u2019s overall strength and integrity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This defect is especially common in parts with complex geometries, multiple gates, or features that interrupt the flow of plastic (e.g., holes, bosses, or ribs).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"392\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line-1024x392.png\" alt=\"Example of knit lines defect in injection molding\" class=\"wp-image-107748\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line-1024x392.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line-300x115.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line-768x294.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line-1536x588.png 1536w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line.png 1808w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of knit lines defect in injection molding\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/welding-line.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of knit lines defect in injection molding<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Low melt temperature<\/strong>: Increase melt temperature to promote better fusion of flow fronts.<\/li>\n\n\n\n<li><strong>Low mold temperature<\/strong>: Ensure mold temperature is high enough to prevent premature solidification at the meeting point.<\/li>\n\n\n\n<li><strong>Poor venting<\/strong>: Improve mold venting near convergence areas to release trapped air and enable stronger bonding.<\/li>\n\n\n\n<li><strong>Improper gate location<\/strong>: Reposition the gate to optimize the flow path and reduce the likelihood of weld lines forming in critical areas.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: In load-bearing or high-stress components, reposition gates or redesign the part to relocate weld lines away from mechanically critical zones.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-11-warping\"><strong>#11 Warping<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Warping is a deformation defect that causes molded parts to twist, bend, or curve undesirably as they cool. It typically results from non-uniform shrinkage within the part\u2014especially in areas with inconsistent wall thickness, uneven cooling, or asymmetrical part geometry. This dimensional instability can render the part non-functional, especially in precision applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Warped components are often rejected due to both poor aesthetics and compromised structural performance. Preventing warping starts with consistent cooling and good mold design, but material choice and process control are equally important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Uneven cooling rates<\/strong>: Maintain uniform mold temperature and allow sufficient cooling time for all part sections.<\/li>\n\n\n\n<li><strong>Inconsistent wall thickness<\/strong>: Redesign the part for uniform wall sections or use ribs to balance structural integrity.<\/li>\n\n\n\n<li><strong>Improper part ejection timing<\/strong>: Avoid ejecting parts before complete solidification to prevent residual stresses from releasing unevenly.<\/li>\n\n\n\n<li><strong>Material-specific shrinkage<\/strong>: Account for the shrinkage behavior of each resin during the design and simulation stages.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"532\" height=\"1006\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Warping-_-Deformation.png\" alt=\"Example of the warping leads to deformation on both sides of the product, resulting in assembly gaps\" class=\"wp-image-107736\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Warping-_-Deformation.png 532w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Warping-_-Deformation-159x300.png 159w\" sizes=\"auto, (max-width: 532px) 100vw, 532px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Warping-_-Deformation.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of the warping leads to deformation on both sides of the product, resulting in assembly gaps\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Warping-_-Deformation.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of the warping leads to deformation on both sides of the product, resulting in assembly gaps<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro\u00a0Tip<\/strong>: Use mold flow analysis to identify hotspots and redesign cooling channels accordingly. Well-placed channels ensure uniform heat dissipation across the mold.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-12-jetting\"><strong>#12<\/strong> <strong>Jetting<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Jetting is a visual surface defect in injection molding where molten plastic enters the mold cavity at high velocity and forms a snake-like, wavy pattern on the part surface. This happens when the polymer jet cools and partially solidifies before the mold is completely filled, causing poor fusion between the front and trailing edges of the flow.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"970\" height=\"590\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting.png\" alt=\"Example of jetting in an injection molded part\" class=\"wp-image-107700\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting.png 970w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting-300x182.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting-768x467.png 768w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting.png\" data-fancybox=\"gallery-107796\" data-caption=\"Example of jetting in an injection molded part\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/jetting.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Example of jetting in an injection molded part<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This defect not only affects the aesthetics of the molded part but can also create localized areas of weakness due to incomplete bonding between the layers of material.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High injection speed<\/strong>: Reduce the initial injection speed or apply a slower first-stage fill to allow more uniform flow.<\/li>\n\n\n\n<li><strong>Small or improperly placed gates<\/strong>: Enlarge the gate or relocate it to improve the melt front\u2019s distribution and reduce turbulence.<\/li>\n\n\n\n<li><strong>Low mold or material temperature<\/strong>: Ensure optimal temperature settings to delay premature solidification and allow smooth flow.<\/li>\n\n\n\n<li><strong>Incorrect RAM speed<\/strong>: Adjust the RAM profile to avoid sudden bursts of flow at the start of injection.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: Incorporating overlapping flow fronts or a fan gate design can help distribute the resin more evenly, reducing velocity peaks that cause jetting.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-13-vacuum-voids\"><strong>#13<\/strong> <strong>Vacuum Voids<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vacuum voids are internal cavities or pockets of trapped air that form within molded parts during the cooling phase of injection molding. These voids are especially common in parts with thicker cross-sections, where uneven cooling causes the outer layers to solidify faster, drawing the molten core material toward the walls and leaving behind a vacuum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While small voids may not affect non-structural parts, they can significantly weaken load-bearing components, compromise dimensional accuracy, and reduce overall part integrity\u2014particularly in applications requiring airtight or watertight performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High melt or mold temperature<\/strong>: Lower the melt and mold temperatures to slow material flow and reduce expansion that leads to void formation.<\/li>\n\n\n\n<li><strong>Low packing pressure<\/strong>: Increase packing and holding pressure to compensate for material shrinkage and eliminate trapped air.<\/li>\n\n\n\n<li><strong>Short holding time<\/strong>: Extend hold time during the packing phase to maintain pressure as the material cools and contracts.<\/li>\n\n\n\n<li><strong>Poor venting or part design<\/strong>: Improve mold venting and avoid abrupt transitions in part thickness to promote even cooling and air escape.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: For thick parts, consider redesigning with uniform wall thickness or hollowing out solid areas with internal ribs to reduce material accumulation and improve cooling uniformity.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-14-discoloration\"><strong>#14<\/strong> <strong>Discoloration<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Discoloration appears on the surface of molded parts as a distinct shade or color from the surrounding material. It often occurs due to molding material contamination, which can happen at the handling and storage stage or during processing. <strong>Discoloration may not directly affect the structural performance of a part<\/strong>, but it significantly reduces its aesthetic quality and marketability.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"766\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration-1024x766.png\" alt=\"Discoloration of a molded part due to excessive baking\" class=\"wp-image-107640\" style=\"max-width:600px\" srcset=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration-1024x766.png 1024w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration-300x224.png 300w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration-768x575.png 768w, https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration.png 1032w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration.png\" data-fancybox=\"gallery-107796\" data-caption=\"Discoloration of a molded part due to excessive baking\" aria-label=\"Open full image\"><img src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2025\/04\/Discoloration.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Discoloration of a molded part due to excessive baking<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Contaminated resin or machine residue: <\/strong>&nbsp;Use thoroughly cleaned machines and purge equipment between material or color changes. Store resins in sealed containers to avoid dust, oil, and moisture contamination.<\/li>\n\n\n\n<li><strong>Excessive heat or prolonged residence time:<\/strong> Lower the barrel temperature and reduce residence time to prevent thermal degradation. Ensure proper cycle times are followed for the selected material.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro\u00a0Tip<\/strong>: Always dry hygroscopic materials\u2014like nylon, PET, or ABS\u2014before molding to prevent moisture-induced color changes.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-15-splay-marks-silver-streaking\"><strong>#15 Splay Marks (Silver Streaking)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Splay marks, also called silver streaking, appear as silvery, streaky patterns radiating from the gate area across the surface of injection-molded parts. This defect typically occurs when moisture or contaminants in the resin vaporize under heat and shear stress, leaving visible surface imperfections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>Key Causes &amp; Solutions:<\/strong><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Excessive resin moisture:<\/strong> Most thermoplastics absorb atmospheric moisture, which vaporizes during injection molding, causing streaks. Use dedicated resin dryers and ensure materials are processed immediately after drying.<\/li>\n\n\n\n<li><strong>High shear rates or injection speeds:<\/strong> High shear during injection leads to polymer breakdown, resulting in surface imperfections. Optimize injection parameters, balancing speed and pressure carefully.<\/li>\n\n\n\n<li><strong>Material contamination:<\/strong> Dirt, oil residues, or incompatible polymers can cause splaying. Maintain stringent hygiene practices in resin handling and processing equipment.<\/li>\n<\/ul>\n\n\n    <section class=\"article-author-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <div class=\"author-block\">\r\n                            <\/div>\r\n                <div class=\"quote-block\" style=\"border-color: #0E6AED;\">\r\n                    <p><strong>Pro Tip<\/strong>: If splay marks persist, consider resin formulation changes or use vented barrel injection machines, which help release entrapped gases before they reach the mold.<\/p>\n                <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\n\n\n<h2 id=\"causes-of-contamination-in-injection-molding-and-how-to-prevent-them\" class=\"wp-block-heading\"><strong>Causes of Contamination in Injection Molding and How to Prevent Them<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contamination is a critical injection molding defect that occurs when foreign substances\u2014such as dust, dirt, metal shavings, oil residues, or degraded plastic\u2014become embedded in the molten material during processing. These contaminants can cause a range of issues, from aesthetic surface defects like discoloration to structural inconsistencies that compromise the part\u2019s mechanical integrity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contaminants typically enter the process through poor material handling, improper <a href=\"https:\/\/staging.xometry.pro\/en\/articles\/injection-molding-molds\/\">tooling and equipment<\/a> maintenance, or wear-related debris. Preventing contamination is essential for achieving consistently high product quality, especially in applications requiring tight tolerances or high visual standards.<\/p>\n\n\n    <aside class=\"article-content-aside\">\r\n        <a href=\"https:\/\/staging.xometry.pro\/en-eu\/articles\/injection-molding-molds\/\" class=\"aside-image sidebar__aside-image\"><img decoding=\"async\" src=\"https:\/\/staging.xometry.pro\/wp-content\/uploads\/2024\/07\/complex-injection-mold-scaled.jpeg\" alt=\"Top view of a complex injection mold used in plastic manufacturing\"><\/a><a href=\"https:\/\/staging.xometry.pro\/en-eu\/articles\/injection-molding-molds\/\" class=\"aside-link\">Injection Molding Molds: Types, Lifespan and Design Tips<\/a>    <\/aside>\r\n    \n\n\n<p class=\"wp-block-paragraph\"><strong>Key Causes &amp; Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Poor storage or handling of plastic resins<\/strong>: use sealed containers and dry materials thoroughly before processing<\/li>\n\n\n\n<li><strong>Dirty hoppers, barrels, or screw components<\/strong>: clean machine parts regularly to prevent build-up and contamination<\/li>\n\n\n\n<li><strong>Cross-contamination from previous runs<\/strong>: purge machines thoroughly between material or color changes<\/li>\n\n\n\n<li><strong>Wear and tear on tooling or equipment<\/strong>: implement scheduled maintenance and replace worn components proactively<\/li>\n\n\n\n<li><strong>Environmental contamination (e.g. airborne particles, oil leaks)<\/strong>: maintain a clean, controlled production area<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pro Tip<\/strong>: Train staff on contamination awareness and enforce cleanroom-style protocols where necessary.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-injection-molding-defects-by-severity-and-cost-impact\"><strong>Injection Molding Defects by Severity and Cost Impact<\/strong><\/h2>\n\n\n<div class=\"custom-table-block \" id=\"table-id-690\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-690\" placeholder=\"Table search\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 26.5464%;\"><b>Defect Type<\/b><\/td>\n<td style=\"width: 17.3969%;\"><b>Structural Impact<\/b><\/td>\n<td style=\"width: 16.2371%;\"><b>Cosmetic Impact<\/b><\/td>\n<td style=\"width: 16.2371%;\"><b>Production Risk<\/b><\/td>\n<td style=\"width: 23.5825%;\"><b>Typical Cost Increase<\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Short Shots<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191\u2191 (part rejected)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Flash<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192 (trimming required)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Improper Parting Line Placement<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191 (mold rework)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Bubbles &amp; Voids<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191 (mold\/process changes)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Gate Vestige<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192 (finishing\/gate changes)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Flow Lines<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192 (process adjustments)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Burn Marks<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191 (process tuning)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Sink Marks<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191 (tool redesign)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Delamination<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191\u2191<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Weld Lines<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Warping<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191\u2191 (rework or scrap)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Jetting<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Vacuum Voids<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Medium<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2191 (tool redesign)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Discoloration<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.5464%;\"><strong>Splay Marks<\/strong><\/td>\n<td style=\"width: 17.3969%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">High<\/span><\/td>\n<td style=\"width: 16.2371%;\"><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td style=\"width: 23.5825%;\"><span style=\"font-weight: 400;\">\u2192 (drying\/parameter fixes)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n\n<h2 id=\"prevent-injection-molding-defects-with-xometry\" class=\"wp-block-heading\"><strong>Prevent Injection Molding Defects with Xometry<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avoiding injection molding defects isn&#8217;t just about technical precision\u2014it&#8217;s about working with a partner who anticipates problems before they happen. At <a href=\"https:\/\/xometry.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Xometry,<\/a> our platform connects you with vetted manufacturers and supports your project from quoting to delivery with real-time visibility and expert guidance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Every part you order through Xometry benefits from a transparent workflow, quality assurance protocols, and on-demand access to engineering support. Whether you&#8217;re prototyping or scaling to production, our team works with you proactively to spot risks early, optimize for manufacturability, and ensure that quality is never left to chance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"author":50,"featured_media":107785,"comment_status":"open","ping_status":"closed","template":"","categories":[],"c-tag-articles":[],"global-tag":[14,82],"class_list":["post-107796","articles","type-articles","status-publish","has-post-thumbnail","hentry","global-tag-injection-molding","global-tag-design"],"acf":[],"_links":{"self":[{"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/articles\/107796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/articles"}],"about":[{"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/types\/articles"}],"author":[{"embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/users\/50"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/comments?post=107796"}],"version-history":[{"count":0,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/articles\/107796\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/media\/107785"}],"wp:attachment":[{"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/media?parent=107796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/categories?post=107796"},{"taxonomy":"c-tag-articles","embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/c-tag-articles?post=107796"},{"taxonomy":"global-tag","embeddable":true,"href":"https:\/\/staging.xometry.pro\/en\/wp-json\/wp\/v2\/global-tag?post=107796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}