Polybutylene terephthalate (PBT) is a thermoplastic engineering polymer, which can be used as insulator of electrical or electronic products. Polybutylene terephthalate is a (semi) crystalline polymer, which is a kind of polyester. Polybutylene terephthalate has stable properties: it is solvent resistant, has little shrinkage in the forming process, and has high mechanical strength. It can resist 150 ° C. with glass fiber, it can improve the heat resistance to 200 ° C. In order to prevent polybutylene terephthalate from burning, it can be treated with flame retardant.
Polybutylene terephthalate has similar properties to other thermoplastic polyesters, and its chemical and physical properties are also similar: compared with polyethylene terephthalate (PET), polybutylene terephthalate has lower strength and stiffness, better impact resistance and lower glass transition temperature. Pet and PBT are sensitive to hot water above 60 ° C. Both plastics are sensitive to ultraviolet rays, so they can not be used outdoors for a long time, but the addition of additives can help the two plastics resist ultraviolet rays.
