PVC plastic is polymerized from vinyl chloride monomer and is one of the commonly used thermoplastics. Its product name is abbreviated as "chlorine plastic" and its English abbreviation is PVC. Pure polyvinyl chloride resin is a hard thermoplastic material, its decomposition temperature is very close to the plasticization temperature, and the mechanical strength is poor. Therefore, PVC resins cannot be used to mold products. Plasticizers, stabilizers, fillers, etc. must be added in order to improve the performance of PVC plastics, and then processed into various products. Polyvinyl chloride is classified into rigid polyvinyl chloride and soft polyvinyl chloride depending on how much plasticizer is added.