The main component of PVC pipe fittings is polyvinyl chloride, a material added with other ingredients to enhance its heat resistance, toughness and ductility. The uppermost layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is a back-coated adhesive. PVC pipe fittings are made of polyvinyl chloride resin, stabilizers, lubricants, etc., and then extruded by hot pressing. They are the first plastic pipes to be developed and applied. PVC pipe fittings have strong corrosion resistance, easy adhesion, low price and hard texture. Plastic pipes are used for drainage, wastewater, chemicals, heating and coolant, food, ultrapure liquids, mud, gas, compressed air and vacuum systems.