{"id":11747,"date":"2026-03-27T05:59:27","date_gmt":"2026-03-27T05:59:27","guid":{"rendered":"https:\/\/ideal-pro.com\/?p=11747"},"modified":"2026-03-27T06:28:07","modified_gmt":"2026-03-27T06:28:07","slug":"heat-resistant-abs-injection-molding-5-keys-to-reducing-internal-stress","status":"publish","type":"post","link":"https:\/\/ideal-pro.com\/nl\/heat-resistant-abs-injection-molding-5-keys-to-reducing-internal-stress\/","title":{"rendered":"Hittebestendig spuitgieten van ABS: 5 sleutels tot het verminderen van interne spanning"},"content":{"rendered":"<p><strong><a href=\"https:\/\/ideal-pro.com\/nl\/douane-abs-injectie-het-vormen-fabriek\/\" target=\"_blank\" rel=\"noopener noreferrer\">Heat-resistant ABS<\/a><sup id=\"fnref-1\"><a href=\"#fn-1\" class=\"footnote-ref\">1<\/a><\/sup><\/strong> is a powerhouse material in the engineering plastics industry. However, achieving high-quality results requires a precise approach to processing.<\/p>\n<p>Standard ABS often lacks the thermal performance required for demanding applications. To bridge this gap, manufacturers have developed heat-resistant ABS resins by copolymerizing with <strong>$alpha$-methylstyrene<\/strong> en <strong>N-phenylmaleimide<\/strong>. These modifications raise the <a href=\"https:\/\/aipprecision.com\/understanding-heat-deflection-temperature-plastics\/\" target=\"_blank\" rel=\"noopener noreferrer\">Warmteafbuigingstemperatuur (HDT)<\/a><sup id=\"fnref-2\"><a href=\"#fn-2\" class=\"footnote-ref\">2<\/a><\/sup> to between <strong>90&deg;C and 120&deg;C<\/strong>.<\/p>\n<h3>&#9888;&#65039; The Core Challenge: Internal Stress<\/h3>\n<p>While these additives improve heat resistance, the molecular structure&mdash;containing rigid benzene rings and N-phenyl groups&mdash;increases steric hindrance. This slows down the relaxation speed of the molecular chains, making the material prone to high <strong>internal stress<\/strong>.<\/p>\n<p>If not managed correctly, this leads to common defects such as:<\/p>\n<ul>\n<li>Stress cracking<\/li>\n<li>Stress whitening<\/li>\n<li>Brittleness<\/li>\n<\/ul>\n<p>Therefore, the golden rule of processing heat-resistant ABS is: <strong>Minimize <a href=\"https:\/\/kingstarmold.com\/causes-of-internal-stress-in-plastic-parts-and-cracking-in-pc-and-abs\/\" target=\"_blank\" rel=\"noopener noreferrer\">internal stress<\/a><sup id=\"fnref-3\"><a href=\"#fn-3\" class=\"footnote-ref\">3<\/a><\/sup>.<\/strong><\/p>\n<p>Here are the 5 critical factors you must control to ensure successful injection molding.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/03\/heat-resistant-abs-injection-molded-automotive-component.jpg\" alt=\"Heat resistant ABS injection molded automotive component\"><\/p>\n<hr>\n<h2>Product and Mold Design<\/h2>\n<p>Design is the foundation. Poor design creates stress traps that no amount of process tuning can fix.<\/p>\n<ul>\n<li><strong>Uniforme wanddikte:<\/strong> Wall thickness variations should be controlled within <strong>25%<\/strong>. Drastic changes cause uneven cooling and stress concentration.<\/li>\n<li><strong>Bosses and Ribs:<\/strong> For columns (bosses) with weak strength, add fillets (R-angles) at the roots or reinforce with ribs to prevent fracture.<\/li>\n<li><strong>Snap-Fit Design:<\/strong> The root of a snap-fit must have a fillet. The ratio of the <strong>R-angle to wall thickness should be &gt; 0.3<\/strong>. While a larger ratio reduces stress, balance it against the risk of surface sink marks.<\/li>\n<li><strong>Cooling Channels:<\/strong> Design cooling water channels to ensure uniform cooling. Uneven cooling leads to uneven shrinkage, which generates internal stress.<\/li>\n<\/ul>\n<blockquote>\n<p><strong>&#128161; Pro Tip:<\/strong> Avoid sharp corners at all costs. Sharp corners are the number one initiator of stress cracks in heat-resistant materials.<\/p>\n<\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/03\/mold-design-guidelines-for-reducing-stress-in-abs-parts.jpg\" alt=\"Mold design guidelines for reducing stress in ABS parts.\"><\/p>\n<hr>\n<h2>Material Drying<\/h2>\n<p>Heat-resistant ABS is hygroscopic. During storage and transport, it absorbs moisture from the air (typically 0.2% ~ 0.4%).<\/p>\n<p>If this moisture is not removed, you will face surface defects like <strong>silver streaks<\/strong> en <strong>water splashes<\/strong>. Because heat-resistant ABS requires higher drying temperatures than standard ABS, strict adherence to drying protocols is essential.<\/p>\n<p><strong>Recommended Drying Parameters:<\/strong><\/p>\n<ul>\n<li><strong>Target Moisture Content:<\/strong> &lt; 0.05% (Ideally &lt; 0.02%)<\/li>\n<li><strong>Drying Temperature:<\/strong> 80&deg;C &ndash; 95&deg;C<\/li>\n<li><strong>Drying Time:<\/strong> 3 &ndash; 4 hours<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/03\/industrial-resin-dryer-for-abs-plastic.jpg\" alt=\"Industrial resin dryer for ABS plastic\"><\/p>\n<hr>\n<h2>Melt Temperature Settings<\/h2>\n<p>Temperature control is about balancing flow with material stability.<\/p>\n<p>You should set the temperature to ensure full plasticization of the resin. Generally, aim for the <strong>middle-to-upper range<\/strong> of the supplier's recommended temperature window.<\/p>\n<p><strong>Why higher temperatures help:<\/strong>\nIncreasing the melt temperature significantly reduces the viscosity of the heat-resistant ABS. This improves flow length and ensures the cavity is filled completely without excessive injection pressure, which can also induce stress.<\/p>\n<hr>\n<h2>Holding Pressure and Time<\/h2>\n<p>For heat-resistant ABS, the holding phase is a balancing act between preventing sink marks and creating stress.<\/p>\n<ul>\n<li><strong>Holding Pressure:<\/strong> Increasing pressure packs the molecules tighter, increasing density and reducing shrinkage. However, <strong>excessive pressure drastically increases internal stress<\/strong>. Use the lowest pressure possible that still maintains part quality.<\/li>\n<li><strong>Holding Time:<\/strong> This should be set based on the time it takes for the gate to freeze.\n<ul>\n<li><em>Too Long:<\/em> Over-packing occurs, molecular gaps shrink too much, and stress rises.<\/li>\n<li><em>Too Short:<\/em> Sink marks appear, and dimensions become unstable.<\/li>\n<\/ul><\/li>\n<\/ul>\n<p><strong>Optimization Strategy:<\/strong> The ideal holding time is the shortest duration where the part weight no longer increases.<\/p>\n<hr>\n<h2>Temperatuurregeling van de schimmel<\/h2>\n<p>Do not skimp on mold temperature. Using a Mold Temperature Controller (MTC) is highly recommended.<\/p>\n<ul>\n<li><strong>Suggested Mold Temperature:<\/strong> <strong>60&deg;C &ndash; 80&deg;C<\/strong><\/li>\n<\/ul>\n<p>A higher mold temperature improves flow, increases weld line strength, and significantly <strong>reduces internal stress<\/strong>.<\/p>\n<p>If the mold temperature is too low, the material freezes too quickly, trapping high levels of stress. This often results in:<\/p>\n<ul>\n<li>Brittle parts<\/li>\n<li>Cracking around screw bosses<\/li>\n<li>Cracking after painting<\/li>\n<\/ul>\n<p><em>Note: While higher mold temperatures improve quality, they will extend the molding cycle time.<\/em><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/03\/mold-temperature-controller-unit-for-injection-molding.jpg\" alt=\"Mold temperature controller unit for injection molding.\"><\/p>\n<hr>\n<h3>Summary Checklist for Heat-Resistant ABS<\/h3>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Parameter<\/th>\n<th style=\"text-align: left;\">Key Takeaway<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Ontwerp<\/strong><\/td>\n<td style=\"text-align: left;\">Keep walls uniform; use R-angles &gt; 0.3 ratio.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Drogen<\/strong><\/td>\n<td style=\"text-align: left;\">Dry at 80-95&deg;C for 3-4 hours. Target &lt;0.05% moisture.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Temp<\/strong><\/td>\n<td style=\"text-align: left;\">Use mid-to-high melt temps to lower viscosity.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Pressure<\/strong><\/td>\n<td style=\"text-align: left;\">Use lower holding pressure to minimize stress.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Mold Temp<\/strong><\/td>\n<td style=\"text-align: left;\">Keep mold at 60-80&deg;C to prevent brittleness.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr><div class=\"footnotes\"><hr><ol><li id=\"fn-1\"><p>Explore the advantages of heat-resistant ABS, a crucial material for high-performance engineering applications.\r <a href=\"#fnref-1\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-2\"><p>Understand the significance of HDT in evaluating the thermal performance of materials.\r <a href=\"#fnref-2\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-3\"><p>Find out how to effectively manage internal stress in heat-resistant ABS to ensure quality.\r <a href=\"#fnref-3\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><\/ol><\/div>","protected":false},"excerpt":{"rendered":"<p>Heat-resistant ABS1 is a powerhouse material in the engineering plastics industry. However, achieving high-quality results requires a precise approach to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11751,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Heat-Resistant ABS Injection Molding: 5 Keys to Reducing Internal Stress","_seopress_titles_desc":"Struggling with stress cracking in Heat-Resistant ABS? Learn the 5 critical processing parameters\u2014from mold design to temperature control\u2014to ensure quality parts.","_seopress_robots_index":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[21],"tags":[38,36],"class_list":["post-11747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-abs-injection-molding","tag-injection-molding"],"acf":[],"_links":{"self":[{"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/posts\/11747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/comments?post=11747"}],"version-history":[{"count":4,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/posts\/11747\/revisions"}],"predecessor-version":[{"id":11758,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/posts\/11747\/revisions\/11758"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/media\/11751"}],"wp:attachment":[{"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/media?parent=11747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/categories?post=11747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ideal-pro.com\/nl\/wp-json\/wp\/v2\/tags?post=11747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}