Plastic measuring cups: plastic material classification

I. Classification according to the heat change of resin

　　(A) thermosetting plastics

　　Thermosetting plastic material refers to a class of plastics that cannot be heated and softened again after molding and repeated processing. The resin is linear prepolymer before processing, chemical cross-linking reaction occurs during processing to make the product internal three-dimensional mesh structure, with insoluble, non-melting characteristics. Such as phenolic resins, amino resins, epoxy resins and unsaturated resins.

　　(B) Thermoplastics

　　Thermoplastic materials refer to a class of plastics that can be re-softened and processed after molding and reheating without change in chemical composition. Its resin before and after processing are linear structure, processing does not occur in the chemical changes, with the characteristics of fusible, soluble.

　　There are many such resins, such as polyethylene, polypropylene, PVC, polystyrene, polyamides, polycarbonate, polyformaldehyde, polyester, polyphenylene ether, polymethyl methacrylate, polyurethane, fluoroplastics, polyphenylene sulfide, polysulfone and polyimide.

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