Polybutylene terephthalate, otherwise known as PBT plastic is a semi crystalline thermoplastic within the polyester family of polymers. Like other polyesters, PBT polymer is particularly suited for applications in the food industry because of its excellent resistance to chlorine and caustic cleaning solutions. PBT polyester material is also characterised by high strength, rigidity and thermal deformation resistance, as well as very high dimensional stability and a low tendency to creep. Furthermore, PBT polymers, like all polyesters, have very good friction and wear properties. Compared to PET polyester, PBT has a better impact strength, particularly at low temperatures. Because of this characteristic, PBT is significantly easier to modify with fibres than PET, and is therefore also generally available as a fibre reinforced product.