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PA Polyamide (nylon) Packing The filling of the mold cavity or cavities as full as possible without causing undue stress on the molds or causing flash to appear on the finished parts PAI Polyamide-imide PAN Polyacrylonitrile Parting line The witness line on the surface of a molded part corresponding to the location where the mold plates were in contact PB Polybutylene PBT Polybutylene terephthalate PBTP Polybutylene terephthalate PC Polycarbonate PCTFE Polychlorotrifluoroethylene PE Polyethylene PEC Polyphenylene ether copolymer