Due to its transparency, excellent rigidity, electrical properties, and printing performance, especially its good hygiene and low cost, polystyrene has broad application prospects in food packaging. In the fields of electromechanical industry, instrumentation, communication equipment industry, etc., it has been widely used as various instrument casings, lampshades, optical parts, instrument parts, transparent window mirrors, transparent models, chemical acid storage tanks, acid transmission tanks, telecommunications parts, high-frequency capacitors, high-frequency insulation gaskets, supports, inserts, and refrigeration insulation materials. It is also widely used in various daily necessities, such as bottle caps, containers, decorations, buttons, combs, toothbrushes, soap boxes, cigarette packs, toys, etc.