PVC main component is polyvinyl chloride, is translucent, yellowish and transparent luster is better than polyethylene polypropylene, difference in polystyrene, along with the different dosage of additives, divided into soft hard polyvinyl chloride (PVC), soft soft, tough, feel sticky, hard ware hardness is higher than that of low density polyethylene, but lower than that of polypropylene, can appear in the inflectional bleaching phenomenon common products: plate doors and Windows wire sheath pipe sole toys stationery and so on is a kind of the use of a of a hydrogen atom replaced by chlorine atoms polyethylene polymer materials.