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发表于 2010-2-24 21:49:00
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Polybutylene terephthalate (PBT) is a plastic that is a thermoplastic crystalline polymer, and a type of polyester. PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150°C (or 200°C with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible.) v% @ I, d+ z
/ ~4 Z! o, }1 F' ^4 zPBT is closely related to other thermoplastic polyesters. % m; z% V: W4 C% C' q! `6 z: u# W
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PBT has slightly lower strength and rigidity, slightly better impact resistance, and a slightly lower glass transition temperature. PBT are sensitive to hot water above 60C (140F).2 l2 d1 w/ G& P% \
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PBT need UV protection if used outdoors, and most grades of these polyesters are flammable, although additives can be used to improve both UV and flammability properties. |
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发表于 2010-2-24 20:43:00
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