PVC is the most widely used general-purpose plastic in the world. It has polar carbon-chlorine bonds, good crystallinity, high strength and flame retardant, so it is the first choice for building materials. It is the first choice for plastic building materials for the production of plastic steel doors and windows, gussets. It can also adjust its crystallinity by adding plasticizers to produce various products ranging from hard, medium hardness, and soft, such as wires and cables, sealing strips, foamed wallpaper, slippers, artificial leather, agricultural films, Infusion bags, even plastic wrap and other products.