Product Introduction. PET sheet is the abbreviation of Polyethylene terephthalate sheet, the chemical formula is (C10H8O4)n, it is synthesized by the exchange of dimethyl terephthalate and ethylene glycol ester (or terephthalic acid and ethylene glycol esterification) to obtain p-benzene Dixy ethyl dicarboxylate, and then subject it to polycondensation reaction.