There are many varieties of materials that will be utilized in the injection molding process. Most polymers is also used including all thermoplastics, some thermosets and a few elastomers.
When these materials are used in the injection molding method, their raw kind is sometimes little pellets or a fine powder. Also, colorants is also added within the method to manage the colour of the final part.
The selection of a material for making injection molded parts isn't only based upon the specified characteristics of the final part. While each and every material has different properties that may have an affect on the strength and performance of the final part, these properties also state the parameters that used in process of these materials.
Each material needs a different set of processing parameters within the injection molding process, aw well as the injection temperature, injection pressure, mold temperature, ejection temperature and cycle time.
A comparison of commonly used materials is shown below.
|Material name||Trade names||Abbreviation||Applications||Description|
|Acetal||Celcon, Delrin, Hostaform, Lucel||POM||Bearings, cams, gears, handles, plumbing components, rollers, rotors, slide guides, valves||Strong, rigid, excellent fatigue resistance, excellent creep resistance, chemical resistance, moisture resistance, naturally opaque white, low/medium cost|
|Acrylic||Diakon, Oroglas, Lucite, Plexiglas||PMMA||Display stands, knobs, lenses, light housings, panels, reflectors, signs, shelves, trays||Rigid, brittle, scratch resistant, transparent, optical clarity, low/medium cost|
|Acrylonitrile Butadiene Styrene||Cycolac, Magnum, Novodur, Terluran||ABS||Automotive (consoles, panels, trim, vents), boxes, gauges, housings, inhalors, toys||Strong, flexible, low mold shrinkage (tight tolerances), chemical resistance, electroplating capability, naturally opaque, low/medium cost|
|Cellulose Acetate||Dexel, Cellidor, Setilithe||CA||Handles, eyeglass frames||Tough, transparent, high cost|
|Polyamide 6 (Nylon)||Akulon, Ultramid, Grilon||PA6||Bearings, bushings, gears, rollers, wheels||High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque/white, medium/high cost|
|Polyamide 6/6 (Nylon)||Kopa, Zytel, Radilon||PA6/6||Handles, levers, small housings, zip ties||High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque/white, medium/high cost|
|Polyamide 11+12 (Nylon)||Rilsan, Grilamid||PA11+12||Air filters, eyeglass frames, safety masks||High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque to clear, very high cost|
|Polycarbonate||Calibre, Lexan, Makrolon||PC||Automotive (panels, lenses, consoles), bottles, containers, housings, light covers, reflectors, safety helmets and shields||Very tough, temperature resistance, dimensional stability, transparent, high cost|
|Polyester - Thermoplastic||Celanex, Crastin, Lupox, Rynite, Valox||PBT, PET||Automotive (filters, handles, pumps), bearings, cams, electrical components (connectors, sensors), gears, housings, rollers, switches, valves||Rigid, heat resistance, chemical resistance, medium/high cost|
|Polyether Sulphone||Victrex, Udel||PES||Valves||Tough, very high chemical resistance, clear, very high cost|
|Polyetheretherketone||PEEKEEK||Aircraft components, electrical connectors, pump impellers, seals||Strong, thermal stability, chemical resistance, abrasion resistance, low moisture absorption|
|Polyetherimide||Ultem||PEI||Electrical components (connectors, boards, switches), covers, sheilds, surgical tools||Heat resistance, flame resistance, transparent (amber color)|
|Polyethylene - Low Density||Alkathene, Escorene, Novex||LDPE||Kitchenware, housings, covers, and containers||Lightweight, tough and flexible, excellent chemical resistance, natural waxy appearance, low cost|
|Polyethylene - High Density||Eraclene, Hostalen, Stamylan||HDPE||Chair seats, housings, covers, and containers||Tough and stiff, excellent chemical resistance, natural waxy appearance, low cost|
|Polyphenylene Oxide||Noryl, Thermocomp, Vamporan||PPO||Automotive (housings, panels), electrical components, housings, plumbing components||Tough, heat resistance, flame resistance, dimensional stability, low water absorption, electroplating capability, high cost|
|Polyphenylene Sulphide||Ryton, Fortron||PPS||Bearings, covers, fuel system components, guides, switches, and shields||Very high strength, heat resistance, brown, very high cost|
|Polypropylene||Novolen, Appryl, Escorene||PP||Automotive (bumpers, covers, trim), bottles, caps, crates, handles, housings||Lightweight, heat resistance, high chemical resistance, scratch resistance, natural waxy appearance, tough and stiff, low cost.|
|Polystyrene - General purpose||Lacqrene, Styron, Solarene||GPPS||Cosmetics packaging, pens||Brittle, transparent, low cost|
|Polystyrene - High impact||Polystyrol, Kostil, Polystar||HIPS||Electronic housings, food containers, toys||Impact strength, rigidity, toughness, dimensional stability, naturally translucent, low cost|
|Polyvinyl Chloride - Plasticised||Welvic, Varlan||PVC||Electrical insulation, housewares, medical tubing, shoe soles, toys||Tough, flexible, flame resistance, transparent or opaque, low cost|
|Polyvinyl Chloride - Rigid||Polycol, Trosiplast||UPVC||Outdoor applications (drains, fittings, gutters)||Tough, flexible, flame resistance, transparent or opaque, low cost|
|Styrene Acrylonitrile||Luran, Arpylene, Starex||SAN||Housewares, knobs, syringes||Stiff, brittle, chemical resistance, heat resistance, hydrolytically stable, transparent, low cost|
|Thermoplastic Elastomer/Rubber||Hytrel, Santoprene, Sarlink||TPE/R||Bushings, electrical components, seals, washers||Tough, flexible, high cost|
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