PBT and PET are sensitive to hot water above 60 ☌ (140 ☏). Compared to PET ( polyethylene terephthalate), PBT has slightly lower strength and rigidity, slightly better impact resistance, and a slightly lower glass transition temperature. PBT is closely related to other thermoplastic polyesters. ![]() It was developed by Britain's Imperial Chemical Industries (ICI). ![]() PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150 ☌ (or 200 ☌ with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible. It is a thermoplastic (semi-)crystalline polymer, and a type of polyester. ![]() Polybutylene terephthalate ( PBT) is a thermoplastic engineering polymer that is used as an insulator in the electrical and electronics industries.
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