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See Chinese contents: GB/T 17931-2018 GB/T 17931-2018: Poly (ethylene terephthalate) (PET) resin for bottles
This Standard specifies the terms and definitions, product classification, requirements, test methods, inspection rules, marking and accompanying documents, packaging, transportation and storage for poly (ethylene terephthalate) (PET) resin for bottles. This Standard applies to homopolymer PET resin that uses purified terephthalic acid and ethylene glycol as the main raw materials, and is produced by direct esterification continuous polycondensation or intermittent polycondensation AND copolymer PET resin that uses purified terephthalic acid, ethylene glycol and isophthalic acid as the main raw materials and adopts direct esterification continuous polycondensation or intermittent polycondensation to produce.
