{"id":2286,"date":"2026-05-19T16:53:43","date_gmt":"2026-05-19T08:53:43","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/blog\/materials\/cnc-auto-draft-material-483179-2\/"},"modified":"2026-06-30T17:40:18","modified_gmt":"2026-06-30T09:40:18","slug":"polystyrene-ps","status":"publish","type":"material","link":"https:\/\/www.jcinjectionmolding.com\/zh\/materials\/polystyrene-ps\/","title":{"rendered":"Polystyrene (PS)"},"content":{"rendered":"
\n

<\/p>\n

\n

Comprehensive Polystyrene (PS) Grades We Mold<\/h2>\n

We process high-performance Polystyrene resins from leading global chemical producers, catering to both high-clarity and heavy-impact applications:<\/p>\n\n\n\n\n\n\n
PS Material Sub-Type<\/th>\nTypical Brand & Grade<\/th>\nKey Characteristics & Advantages<\/th>\n<\/tr>\n<\/thead>\n
GPPS
\n(General Purpose)<\/td>\n		\u2022 Trinseo STYRON 678D
\n\u2022 Sabic GPPS 150
\n\u2022 Chi Mei PG-33
\n\u2022 TotalEnergies GPPS 1540<\/td>\n		Outstanding optical clarity, high stiffness, and brilliant gloss. However, it is relatively brittle. Ideal for medical labware, plastic cutlery, cosmetic containers, and jewel boxes.<\/td>\n<\/tr>\n
HIPS
\n(High Impact)<\/td>\n		\u2022 Trinseo STYRON A-tech 1175
\n\u2022 Sabic HIPS 638
\n\u2022 Chi Mei PH-88S
\n\u2022 TotalEnergies HIPS 8260<\/td>\n		Modified with butadiene rubber to offer high impact toughness and dimensional stability. Opaque with a matte or satin surface. Ideal for electronic housings, toys, and structural components.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

<\/p>\n

\n

Applicable Molding Processes for Polystyrene (PS)<\/h2>\n

Polystyrene’s low shrinkage and easy melt flow make it highly adaptable to multiple specialized molding methods:<\/p>\n\n\n\n\n\n\n\n\n
Molding Process<\/th>\nProcess Suitability & Application<\/th>\n<\/tr>\n<\/thead>\n
Standard Injection Molding<\/td>\nExcellent. Highly suitable for producing rigid, high-gloss consumer goods and robust structural frames with quick cycle times.<\/td>\n<\/tr>\n
Thin-Wall Molding<\/td>\nHigh. Polystyrene’s easy flow properties allow for the high-speed production of thin-walled cosmetic containers and food packaging cups.<\/td>\n<\/tr>\n
Insert Molding<\/td>\nGood (Mostly with HIPS). Rigid metal screws or connectors can be easily molded into HIPS housings to build reliable electronic assemblies.<\/td>\n<\/tr>\n
Overmolding \/ Multi-Shot<\/td>\nGood. HIPS is often overmolded with compatible grades of soft thermoplastic elastomers (TPE) to create durable handles and aesthetic grips.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

<\/p>\n

\n

Polystyrene (PS) Manufacturing & Tooling Guide<\/h2>\n

Polystyrene is amorphous and highly dimensionally stable, but it requires careful tooling parameters to avoid brittle cracking and surface splay:<\/p>\n

    \n
  • Pre-Drying:<\/strong> Polystyrene has low water absorption (<0.1%). However, for high-gloss, crystal-clear GPPS applications, we pre-dry the resin at 70\u00b0C\u201380\u00b0C (158\u00b0F\u2013176\u00b0F) for 1\u20132 hours to eliminate moisture marks.<\/li>\n
  • Melt Temperature:<\/strong> GPPS runs between 180\u00b0C and 260\u00b0C (356\u00b0F\u2013500\u00b0F), while HIPS operates between 190\u00b0C and 240\u00b0C (374\u00b0F\u2013464\u00b0F). Careful melt temperature control is vital to prevent thermal degradation of HIPS rubber elements.<\/li>\n
  • Mold Temperature:<\/strong> Kept at 30\u00b0C to 60\u00b0C (86\u00b0F\u2013140\u00b0F). Low mold temperatures shorten cycle times, while higher mold temperatures improve surface finish and decrease internal stresses.<\/li>\n
  • Ejection System Design:<\/strong> Because GPPS is brittle, sharp corners and high local stresses can cause cracks during ejection. We design generous draft angles (at least 1\u00b0 to 1.5\u00b0) and wide ejector pins to distribute forces evenly.<\/li>\n
  • Weld Line Optimization:<\/strong> For clear GPPS parts, weld lines will compromise both aesthetics and optical transparency. Jucheng\u2019s tooling engineers optimize runner systems and gates using DFM software to shift weld lines to non-visible areas.<\/li>\n<\/ul>\n<\/section>\n

    <\/p>\n

    \n

    Key Application Industries for Molded PS Parts<\/h2>\n
      \n
    • Medical & Laboratory Diagnostics (ISO 13485):<\/strong> Clear petri dishes, test tubes, microplates, disposable pipettes, and diagnostic cassettes.<\/li>\n
    • Consumer Electronics:<\/strong> TV housings, refrigerator door liners, audio cassette cases, remote control housings, and toy structural parts.<\/li>\n
    • Cosmetic & Food Packaging:<\/strong> Highly transparent cosmetic jars, clear plastic cups, thin-walled food containers, and disposable cutlery.<\/li>\n
    • Industrial & Appliance Housings:<\/strong> Refrigerator shelves, control panels, protective structural shells, and light-diffusing plates.<\/li>\n<\/ul>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

      Comprehensive Polystyrene (PS) Grades We Mold We process high-performance Polystyrene resins from leading global chemical producers, catering to both high-clarity and heavy-impact applications: PS Material Sub-Type Typical Brand & Grade Key Characteristics & Advantages GPPS (General Purpose) \u2022 Trinseo STYRON 678D \u2022 Sabic GPPS 150 \u2022 Chi Mei PG-33 \u2022 TotalEnergies GPPS 1540 Outstanding optical […]<\/p>\n","protected":false},"featured_media":2404,"template":"","meta":[],"material_type":[22],"application_feature":[],"machining_process":[],"class_list":["post-2286","material","type-material","status-publish","has-post-thumbnail","hentry","material_type-commodity-plastics"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/material\/2286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/material"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/types\/material"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/media\/2404"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/media?parent=2286"}],"wp:term":[{"taxonomy":"material_type","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/material_type?post=2286"},{"taxonomy":"application_feature","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/application_feature?post=2286"},{"taxonomy":"machining_process","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/zh\/wp-json\/wp\/v2\/machining_process?post=2286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}