Engineering plastics can be divided into general engineering plastics and special engineering plastics. The former main varieties are polyamide, polycarbonate, polyoxymethylene, modified polyphenylene ether and thermoplastic polyester five general engineering plastics; the latter mainly refers to engineering plastics with heat resistance above 150 ℃, the main varieties are polyimide , polyphenylene sulfide, polysulfone, aromatic polyamide, polyarylate, polyphenylate, polyaryletherketone, liquid crystal polymer and fluororesin, etc.
