Properties of Plastics Machinery's Handbook, 31st Edition
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PLASTICS Properties of Plastics Characteristics of Important Plastics Families
ABS (acrylonitrile- butadiene-styrene) Rigid, relatively low-cost thermoplastic, easily machined and thermo- formed. Acetal, POM Engineering thermoplastic with good strength, wear resistance, and dimensional stability. More dimensionally stable than nylon under wet and humid conditions. Acrylic, PMMA Clear, transparent, strong, break-resistant thermoplastic with excellent chemical resistance and weatherability. CPVC (chlorinated PVC) Thermoplastic with properties similar to PVC, but operates to a 40–60 ° F (14–16°C) higher temperature. Fiberglass Thermosetting composite with high strength-to-weight ratio, excellent dielectric properties, and unaffected by corrosion.
Liquid crystal polymer (LCP)
Aromatic, highly inert polymer, with excellent mechanical properties, as well as chemical, fire, and temperature resistance. Thermoplastic with excellent impact resistance, ideal for wear applications such as bearings and gears, self-lubricating under some circumstances. Engineering thermoplastic, excellent temperature resistance, suitable for continuous use above 500 ° F (260°C), excellent flexural and tensile properties. Dimensionally stable thermoplastic with superior machining characteristics compared to acetal.
Nylon
PEEK (polyetherether- ketone) Polyester, PET (polyethylene- terephthalate)
Phenolic Thermosetting family of plastics with minimal thermal expansion, high compressive strength, excellent wear and abrasion resistance, and a low coefficient of friction. Used for bearing applications and molded parts. Polycarbonate, PC Transparent tough thermoplastic with high impact strength, excellent chemical resistance and electrical properties, and good dimensional stability. Polypropylene, PP Good chemical resistance combined with low moisture absorption and excellent electrical properties, retains strength up to 250 ° F (120°C). Polystyrene, PS Transparent, colorless, and relatively low-cost amorphous thermoplastic. Relatively rigid with good electrical properties but brittle with poor chemical and ultraviolet properties. Polysulfone, PSU Durable thermoplastic, good electrical properties, operates at temperatures in excess of 300 ° F (150°C). Polyurethane Thermoplastic, excellent impact and abrasion resistance, resists sunlight and weathering. Teflon, PTFE ( polytetrafluoro- ethylene) Thermoplastic, low coefficient of friction, withstands up to 500 ° F (260°C), inert to chemicals and solvents, self-lubricating with a low thermal-expan sion rate.
PVC ( polyvinyl chloride) PVDF ( polyvinylidene- fluoride)
Thermoplastic, resists corrosive solutions and gases both acid and alkaline, good stiffness. Thermoplastic, outstanding chemical resistance, excellent substitute for PVC or polypropylene. Good mechanical strength and dielectric properties.
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