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Polyesters (PBT)

Polybutylene terephthalate (PBT) is a thermoplastic (semi-)crystalline polymer, and a type of polyester. PBT is closely related to other thermoplastic polyesters. Compared to PET (polyethylene terephthalate), PBT has slightly lower strength and rigidity, slightly better impact resistance, and a slightly lower glass transition temperature.

PBT can match the mechanical properties of PET, particularly when reinforced with glass fibre.

PBT is well suited to thin wall mouldings.

Applications

Fibers in toothbrushes. PBT can also be made into yarn, coatings for optical cables.