{"id":2309,"date":"2026-05-21T09:45:00","date_gmt":"2026-05-21T01:45:00","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/?p=2309"},"modified":"2026-06-30T17:15:49","modified_gmt":"2026-06-30T09:15:49","slug":"polypropylene-pp","status":"publish","type":"material","link":"https:\/\/www.jcinjectionmolding.com\/ja\/materials\/polypropylene-pp\/","title":{"rendered":"Polypropylene (PP)"},"content":{"rendered":"
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Common Polypropylene (PP) Grades We Mold<\/h2>\n

We source and process high-quality PP resins from global leading manufacturers to meet specific functional requirements:<\/p>\n\n\n\n\n\n\n\n
PP Material Sub-Type<\/th>\nTypical Brand & Grade<\/th>\nKey Characteristics & Advantages<\/th>\n<\/tr>\n<\/thead>\n
PP Homopolymer<\/td>\nLyondellBasell Moplen HP500N
\nExxonMobil PP1013<\/td>\n		High stiffness-to-weight ratio, excellent chemical resistance, and elevated temperature resistance. Ideal for rigid packaging and household appliances.<\/td>\n<\/tr>\n
PP Impact Copolymer<\/td>\nSabic PP 570P
\nLyondellBasell Moplen EP300K<\/td>\n		Enhanced impact strength at low temperatures, high durability, and crack resistance. Widely used for automotive bumpers, battery cases, and heavy-duty crates.<\/td>\n<\/tr>\n
PP Random Copolymer<\/td>\nBorealis RF365MO
\nTotalEnergies PPR 7220<\/td>\n		Superior optical clarity, high gloss, and good impact resistance. Frequently specified for medical syringes, labware, and transparent housewares.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Applicable Molding Processes for PP<\/h2>\n

Polypropylene’s excellent melt flow behavior and adaptability allow it to be processed via several molding techniques:<\/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 high-volume consumer goods, living hinges, and structural components with optimized cycle times.<\/td>\n<\/tr>\n
Thin-Wall Molding<\/td>\nHigh. PP’s high melt flow index (MFI) allows it to easily fill long flow paths and thin-walled structures, ideal for food containers and medical disposable packaging.<\/td>\n<\/tr>\n
Insert Molding<\/td>\nModerate to High. Metal inserts, threads, or structural plates can be molded directly into PP parts to improve local mechanical strength.<\/td>\n<\/tr>\n
Overmolding \/ 2K Molding<\/td>\nGood. Frequently overmolded with thermoplastic elastomers (TPE\/TPU) to create soft-touch handles, seals, or non-slip grips.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Polypropylene (PP) Manufacturing & Processing Guide<\/h2>\n

To achieve high structural integrity and dimensional consistency, our engineering team adheres to scientific molding parameters for PP resins:<\/p>\n

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  • Pre-Drying:<\/strong> Generally not required as PP absorbs minimal moisture. However, for critical medical or high-aesthetic applications, we pre-dry at 80\u00b0C (176\u00b0F) for 1\u20132 hours to eliminate surface splay.<\/li>\n
  • \u6eb6\u878d\u6e29\u5ea6\uff1a<\/strong> Typically set between 200\u00b0C and 250\u00b0C (392\u00b0F to 482\u00b0F). Thermal degradation can occur if temperatures exceed 280\u00b0C.<\/li>\n
  • Mold Temperature:<\/strong> Kept between 20\u00b0C and 80\u00b0C (68\u00b0F to 176\u00b0F). Higher mold temperatures improve gloss and crystallinity but can increase cycle times and shrinkage.<\/li>\n
  • Injection Pressure:<\/strong> Injection pressure is usually maintained between 50 and 120 MPa, with adequate holding pressure to minimize shrinkage and sink marks.<\/li>\n
  • Shrinkage Control:<\/strong> Volumetric shrinkage ranges from 1.5% to 2.0%. Jucheng\u2019s tooling engineers compensate for this shrinkage through precision mold core\/cavity dimension adjustments.<\/li>\n<\/ul>\n<\/section>\n

    <\/p>\n

    \n

    Key Application Industries for PP Molded Parts<\/h2>\n
      \n
    • Medical Devices (ISO 13485 Compliant):<\/strong> Autoclavable laboratory vials, syringe plungers, diagnostic test kits, and pill dispensers.<\/li>\n
    • Automotive Components (IATF 16949 Compliant):<\/strong> Battery cases, interior door panels, dashboard trims, bumper covers, and fluid reservoirs.<\/li>\n
    • Packaging & Closures:<\/strong> Hinged caps, child-resistant closures, food containers, thin-walled storage boxes, and household bins.<\/li>\n
    • Consumer & Industrial Goods:<\/strong> Power tool housings, appliance brackets, lawnmower components, and heavy-duty structural gears.<\/li>\n<\/ul>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

      Common Polypropylene (PP) Grades We Mold We source and process high-quality PP resins from global leading manufacturers to meet specific functional requirements: PP Material Sub-Type Typical Brand & Grade Key Characteristics & Advantages PP Homopolymer LyondellBasell Moplen HP500N ExxonMobil PP1013 High stiffness-to-weight ratio, excellent chemical resistance, and elevated temperature resistance. Ideal for rigid packaging and household appliances. PP Impact Copolymer Sabic PP 570P LyondellBasell Moplen EP300K Enhanced impact strength at low temperatures, high durability, and crack resistance. Widely used for automotive bumpers, battery cases, and heavy-duty crates. PP Random Copolymer Borealis RF365MO TotalEnergies PPR 7220 Superior optical clarity, high gloss, and good impact resistance. Frequently specified for medical syringes, labware, […]<\/p>\n","protected":false},"featured_media":2262,"template":"","meta":[],"material_type":[22],"application_feature":[],"machining_process":[],"class_list":["post-2309","material","type-material","status-publish","has-post-thumbnail","hentry","material_type-commodity-plastics"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/material\/2309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/material"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/types\/material"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/media\/2262"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/media?parent=2309"}],"wp:term":[{"taxonomy":"material_type","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/material_type?post=2309"},{"taxonomy":"application_feature","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/application_feature?post=2309"},{"taxonomy":"machining_process","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/machining_process?post=2309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}