PVC: Polyvinyl chloride, linear amorphous structure. Mechanism of vinyl chloride monomer by the action of a peroxide, azo-bis-isobutyronitrile initiator is a radical polymerization reaction by polymerization.
　　The main properties are: fairly stiff, has good chemical resistance, but brittle and hard, less elastic, with combustion and self-extinguishing.
　　PET: polyethylene terephthalate. Terephthalic acid or dimethyl terephthalate and ethylene glycol are subjected to ester exchange reaction of the thermoplastic resin is obtained.
　　The main properties are: high tensile strength, stiffness and hardness. Thermal properties of PET long-term use temperature up to 120 degrees, water absorption, good chemical stability and electrical insulation.