Polyvinyl chloride, referred to as PVC, is one of the earliest industrialized plastic varieties, and its current output is second only to polyethylene, ranking second. Polyvinyl chloride has been widely used in industry, agriculture and daily life. It is thermoplastic. White or light yellow powder. The relative density is 1.35~1.40.The melting point is about 70-85°C. Soluble or swellable by ketones, esters, chlorinated hydrocarbons. Has excellent chemical resistance. The thermal stability and light resistance are poor. When the chemical book is above 00°C or exposed to sunlight for a long time, it begins to decompose hydrogen chloride. It is necessary to add a stabilizer when making plastics. Excellent electrical insulation, will not burn. For the system of plastics, coatings and synthetic fibers. Depending on the amount of plasticizer added, soft and hard plastics can be produced. The former can be used to make transparent films (such as raincoats, tablecloths, packaging materials, agricultural films, etc.), artificial leather, foam plastics and wire sheathing, etc. The latter can be used to make plates, pipes, valves, doors and windows, etc. Suspension polymerization, in powdery resin. It can be polymerized by emulsion method to obtain pasty resin. Can be used to make soft or hard plastic.