{"id":2982,"date":"2026-08-12T16:45:40","date_gmt":"2026-08-12T08:45:40","guid":{"rendered":"http:\/\/0"},"modified":"2026-08-11T17:56:22","modified_gmt":"2026-08-11T09:56:22","slug":"selecting-high-performance-insert-molding-materials","status":"publish","type":"post","link":"https:\/\/www.jcinjectionmolding.com\/ko\/blog\/selecting-high-performance-insert-molding-materials\/","title":{"rendered":"\uace0\uc131\ub2a5 \uc778\uc11c\ud2b8 \ubab0\ub529 \uc7ac\ub8cc \uc120\ud0dd"},"content":{"rendered":"<article style=\"font-family: -apple-system, BlinkMacSystemFont, &#039;Segoe UI&#039;, Roboto, Helvetica, Arial, sans-serif;color: #333333;width: 100%\">\n<section style=\"margin-bottom: 30px\">\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Selecting optimal engineering resins for metal-plastic hybrid components directly determines interfacial bond strength, creep resistance, and long-term joint durability. Metallic inserts composed of brass, copper, stainless steel, or aluminum exhibit thermal expansion behavior radically different from raw thermoplastics. Exposing mismatched hybrid assemblies to rapid temperature changes induces severe mechanical shear stress along the polymer-metal boundary.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2986\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test.webp\" alt=\"environmental-thermal-shock-test\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/environmental-thermal-shock-test-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Thermal shock cycling can trigger micro-cracking in low-elongation plastics or cause interfacial delamination around metallic contact pins. This technical material guide reviews coefficient of thermal expansion (CTE) matching strategies, high-temperature resin processing, and raw material traceability protocols.<\/p>\n<\/section>\n<p><!-- Table of Contents --><\/p>\n<section style=\"background-color: #f8f9fa;border-left: 4px solid #0056b3;padding: 24px;border-radius: 6px;margin: 40px 0\">\n<h3 style=\"font-size: 22px;font-weight: bold;line-height: 1.5em;margin-top: 0;margin-bottom: 16px;color: #111111\">\ubaa9\ucc28<\/h3>\n<ul style=\"list-style-type: none;padding-left: 0;margin: 0\">\n<li style=\"margin-bottom: 12px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#cte-matching\">1. Matching Coefficient of Thermal Expansion (CTE) to Prevent Stress Cracking<\/a><\/li>\n<li style=\"margin-bottom: 12px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#high-temp-processing\">2. High-Temperature Processing (Up to 420\u00b0C) for Metal Encapsulation<\/a><\/li>\n<li style=\"margin-bottom: 0\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#resin-library\">3. 200+ Production Resin Library &amp; Material Yellow Card Verification<\/a><\/li>\n<\/ul>\n<\/section>\n<p><!-- Section 1 --><\/p>\n<section id=\"cte-matching\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Matching Coefficient of Thermal Expansion (CTE) to Prevent Stress Cracking<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2987\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert.webp\" alt=\"glass-filled-nylon-brass-insert\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/glass-filled-nylon-brass-insert-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Selecting suitable <a href=\"https:\/\/www.jcinjectionmolding.com\/ko\/materials\/\"><strong>insert molding materials<\/strong><\/a> requires matching the thermal expansion behavior of the polymer matrix with the embedded metal fastener. Metals expand and contract at 16.5 to 18.5 ppm\/K, whereas unfilled engineering plastics expand at 60 to 100 ppm\/K upon heating. Compounding base polymers with glass fibers aligns the resin CTE closer to metallic levels, drastically reducing differential thermal contraction.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Glass-reinforced grades like <strong>PA66-GF30<\/strong>, <strong>PBT<\/strong>, \ubc0f <strong>PPS<\/strong> provide high modulus while limiting thermal expansion to 20-30 ppm\/K. Evaluating physical <strong>insert molding materials<\/strong> prevents localized stress cracking around sharp metal corners under cyclic temperature testing.<\/p>\n<p><!-- Table 1: Material CTE Comparison Table --><\/p>\n<div style=\"margin: 32px 0\">\n<table style=\"width: 100%;border-collapse: collapse;font-size: 16px;text-align: left;min-width: 600px\">\n<thead>\n<tr style=\"background-color: #f8f9fa;border-bottom: 2px solid #dee2e6\">\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Material Grade<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Material Family<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Linear CTE (ppm\/K)<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Heat Deflection Temp (\u00b0C)<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Insert Molding Suitability<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\ud669\ub3d9 (C36000)<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Copper Alloy Metal<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">18.5<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">N\/A (Metallic)<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Standard threaded fastener insert baseline<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Zytel 70G33L (PA66-GF30)<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Glass-Filled Polyamide<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">25.0<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">240\u00b0C<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Optimal CTE match with brass\/copper busbars<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Valox 420 (PBT-GF30)<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Glass-Filled Polyester<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">30.0<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">205\u00b0C<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Excellent dimensional stability &amp; electrical isolation<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Victrex PEEK 450G<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Polyetheretherketone<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">45.0<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">160\u00b0C<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">High-temperature aerospace &amp; clinical metal replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<p><!-- Section 2 --><\/p>\n<section id=\"high-temp-processing\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">High-Temperature Processing (Up to 420\u00b0C) for Metal Encapsulation<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2984\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin.webp\" alt=\"bimetallic-screw-high-temp-resin\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/bimetallic-screw-high-temp-resin-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Extreme operating environments in automotive under-hood assemblies, aerospace connectors, and downhole sensors demand super-polymers. Specialized high-heat resins like <strong>PEEK<\/strong>, <strong>PEI (Ultem)<\/strong>, <strong>LCP<\/strong>, \ubc0f <a href=\"https:\/\/www.jcinjectionmolding.com\/ko\/materials\/psu-ppsu-polysulfone\/\"><strong>PSU\/PPSU<\/strong><\/a> maintain dimensional stability and electrical insulation above 200\u00b0C.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Processing high-heat <strong>insert molding materials<\/strong> up to 420\u00b0C requires custom <strong>bimetallic barrels<\/strong> engineered to withstand high thermal loads and abrasive fillers. High mold temperatures held between 140\u00b0C and 180\u00b0C ensure complete polymer crystallization, maximizing chemical resistance against automotive fluids and solvents.<\/p>\n<\/section>\n<p><!-- Section 3 --><\/p>\n<section id=\"resin-library\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">200+ Production Resin Library &amp; Material Yellow Card Verification<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2983\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation.webp\" alt=\"ul-yellow-card-material-documentation\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/ul-yellow-card-material-documentation-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Encapsulating metal fasteners through custom <a href=\"https:\/\/www.jcinjectionmolding.com\/ko\/blog\/precision-insert-molding-for-threaded-inserts-and-busbars\/\"><strong>\uc778\uc11c\ud2b8 \ubab0\ub529<\/strong><\/a> relies on pure raw materials free from volatile contaminants. Verifying raw material shipments against Underwriters Laboratories (UL) Yellow Card records ensures compliance with <strong>UL94 V-0<\/strong> flammability criteria.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Sourcing certified <strong>insert molding materials<\/strong> backed by UL Yellow Card documentation prevents lot-to-lot performance variations in high-voltage components. Clinical applications process biocompatible resins meeting <strong>USP Class VI<\/strong> \ubc0f <strong>ISO 10993<\/strong> standards, providing full material Certificate of Analysis (COA) traceability.<\/p>\n<\/section>\n<p><!-- FAQ Section --><\/p>\n<section id=\"faq\" style=\"margin-bottom: 40px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">\uc790\uc8fc \ubb3b\ub294 \uc9c8\ubb38 (FAQ)<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2988\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test.webp\" alt=\"microscopic-metal-polymer-adhesion-test\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/microscopic-metal-polymer-adhesion-test-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Why does glass fiber reinforcement help prevent stress cracking in insert molding?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Adding glass fibers lowers the coefficient of thermal expansion (CTE) of engineering plastics, bringing it closer to the CTE of metals like copper and brass. Aligning expansion rates reduces thermal contraction stress along the polymer-metal interface, eliminating post-mold micro-cracks during temperature cycling.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">What is the benefit of UL Yellow Card material verification for medical and electrical parts?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">UL Yellow Card verification confirms that every resin lot meets specific flammability, electrical arc resistance, and thermal aging parameters certified by Underwriters Laboratories. Verifying yellow card documentation prevents uncertified or contaminated raw materials from compromising safety compliance.<\/p>\n<\/div>\n<div style=\"margin-bottom: 0\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Which engineering plastics provide the best chemical adhesion to brass inserts?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Amorphous polymers like PC\/ABS alloys and modified PBT resins deliver excellent mechanical and chemical interdiffusion around knurled brass inserts. High resin elongation properties allow these polymers to absorb local thermal stresses without developing stress cracks.<\/p>\n<\/div>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Selecting optimal engineering resins for metal-plastic hybrid components directly determines interfacial bond strength, creep resistance, and long-term joint durability. Metallic inserts composed of brass, copper, stainless steel, or aluminum exhibit thermal expansion behavior radically different from raw thermoplastics. Exposing mismatched hybrid assemblies to rapid temperature changes induces severe mechanical shear stress along the polymer-metal boundary. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2985,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2982","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts\/2982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/comments?post=2982"}],"version-history":[{"count":0,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/posts\/2982\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/media\/2985"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/media?parent=2982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/categories?post=2982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ko\/wp-json\/wp\/v2\/tags?post=2982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}