Polystyrene (PS) is a thermoplastic non-crystalline resin, which is polymerized from styrene monomer. It can be polymerized by a variety of synthetic methods. Currently, bulk polymerization and suspension polymerization are mainly used in industry. PS is mainly divided into general-purpose polystyrene(GPPS), High-impact polystyrene(HIPS). Because polystyrene is transparent and has excellent rigidity, electrical properties and printing properties, especially good hygiene and low price, it has broad application prospects in food packaging. In the mechanical and electrical industry, instrumentation, communication equipment industry, etc., it has been widely used as various instrument shells, lampshades, optical parts, instrument parts, transparent window mirrors, transparent models, chemical acid storage tanks, acid conveying tanks, telecommunication parts, high-frequency Capacitors, high-frequency insulating gaskets, brackets, inserts and refrigerated insulating materials, etc.