{"id":2366,"date":"2026-05-23T11:25:16","date_gmt":"2026-05-23T03:25:16","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/?p=2366"},"modified":"2026-05-29T15:42:39","modified_gmt":"2026-05-29T07:42:39","slug":"ps-trinseo-styron-678d","status":"publish","type":"material_model","link":"https:\/\/www.jcinjectionmolding.com\/vi\/materials\/polystyrene-ps\/ps-trinseo-styron-678d\/","title":{"rendered":"PS-Trinseo STYRON 678D"},"content":{"rendered":"
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Trinseo STYRON 678D Physical and Optical Properties<\/h2>\n

STYRON\u2122 678D is a prime general purpose polystyrene (GPPS) resin engineered by Trinseo to deliver glass-like clarity, high thermal stability, and low-stress moldability:<\/p>\n\n\n\n\n\n\n\n
Optical & Structural Property<\/th>\nSTYRON 678D Typical Value<\/th>\nEngineering Molding Advantage<\/th>\n<\/tr>\n<\/thead>\n
Optical Clarity<\/td>\nGlass-Like High Light Transmission<\/td>\nProvides absolute transparency and high gloss directly from polished core cavities, ideal for medical diagnostics and optical lenses.<\/td>\n<\/tr>\n
Heat Resistance<\/td>\nVicat Softening Temperature 97.2\u00b0C<\/td>\nMaintains rigid structural geometry under moderate thermal stress. Excellent for display cases and food service packaging.<\/td>\n<\/tr>\n
Food Safety<\/td>\nFDA 21 CFR 177.1640 Compliant<\/td>\nEnsures complete compliance for contact with food and household consumables, featuring ultra-low volatile outgassing.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Process Compatibility for STYRON 678D<\/h2>\n

With a Melt Flow Rate of 10 g\/10 min, STYRON 678D flows smoothly to support thin-walled, high-volume injection molding runs:<\/p>\n\n\n\n\n\n\n\n
Process Category<\/th>\nMolding Strategy & Application Details<\/th>\n<\/tr>\n<\/thead>\n
Standard & Optical Molding<\/td>\nExcellent. Fully optimized for high-transparency medical petri dishes, lab cuvettes, cosmetic display jars, and compact disc jewel cases.<\/td>\n<\/tr>\n
Bao b\u00ec th\u00e0nh m\u1ecfng<\/td>\nExcellent. Stable flow behaviors at low melt temperatures allow rapid, high-pressure injection into thin-walled disposable cutlery and clear tumblers.<\/td>\n<\/tr>\n
Co-Extrusion Cap Coating<\/td>\nGood. Highly compatible with other easy-flowing polymers to provide a protective, high-gloss clear outer barrier on structural components.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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PS-Trinseo STYRON 678D Tooling & Brittle Fracture Prevention Guide<\/h2>\n

STYRON 678D is an amorphous resin offering extremely low shrinkage, but its brittle nature (Tensile Strain 1-3%) requires meticulous mold design and process care:<\/p>\n

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  • Brittle Fracture & Ejection Design:<\/strong> Because GPPS has negligible elongation, parts can crack easily around sharp corners during mold release. Jucheng\u2019s tooling division machines generous draft angles (minimum 1.5\u00b0 to 2\u00b0) and implements broad, strategically positioned ejector pins to distribute demolding forces evenly.<\/li>\n
  • Mirror-Surface Mold Polishing:<\/strong> Any microscopic tool mark on core or cavity surfaces will scatter light and compromise optical clarity. We use S136 stainless steel mold cavity blocks, mirror-polished to a pristine finish, to ensure maximum light transmission.<\/li>\n
  • Thermal and Pressure Profiles:<\/strong> Processing melt temperatures are kept at 199\u00b0C\u2013249\u00b0C (390\u00b0F to 480\u00b0F). Mold temperatures are managed between 17\u00b0C and 65\u00b0C (63\u00b0F\u2013149\u00b0F) using pressurized temperature controllers. Slower injection and low holding pressures are applied to avoid residual stresses.<\/li>\n
  • Low Isotropic Shrinkage:<\/strong> STYRON 678D exhibits extremely low shrinkage (typically 0.3% to 0.6%). This amorphous behavior enables us to hold extremely tight dimensional tolerances for stackable diagnostic labware.<\/li>\n<\/ul>\n<\/section>\n

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    Key Application Fields for PS-Trinseo STYRON 678D<\/h2>\n
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    • Medical Diagnostics & Labware (ISO 13485):<\/strong> Crystal-clear petri dishes, laboratory test tubes, microplates, transparent cuvettes, and pipette cassettes.<\/li>\n
    • Cosmetic & Consumer Packaging:<\/strong> Luxury thick-walled cosmetic jars, transparent covers, CD\/DVD jewel cases, and retail display organizers.<\/li>\n
    • Thin-Walled Housewares:<\/strong> Disposable plastic cutlery, clear party tumblers, storage canisters, and high-gloss rigid desk organizers.<\/li>\n<\/ul>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

      Trinseo STYRON 678D Physical and Optical Properties STYRON\u2122 678D is a prime general purpose polystyrene (GPPS) resin engineered by Trinseo to deliver glass-like clarity, high thermal stability, and low-stress moldability: Optical & Structural Property STYRON 678D Typical Value Engineering Molding Advantage Optical Clarity Glass-Like High Light Transmission Provides absolute transparency and high gloss directly from […]<\/p>\n","protected":false},"featured_media":2434,"template":"","meta":[],"class_list":["post-2366","material_model","type-material_model","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/material_model\/2366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/material_model"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/types\/material_model"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/media\/2434"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/media?parent=2366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}