The abbreviation of polyethylene terephthalate is PET or PETP. Polyethylene terephthalate plastics mainly include polyethylene terephthalate PET and polybutylene terephthalate PBT. Polyethylene terephthalate is also commonly known as polyester resin, commonly known as polyester resin. It is a polycondensate of terephthalic acid and ethylene glycol. Together with PBT, it is called thermoplastic polyester or saturated polyester.