This standard specifies the technical requirements, test methods, inspection rules, etc. of polyvinyl chloride (PVC) thermal cissing films and sleeves. It is applicable to heat shrinkable films and tubes formed by bubble tube method using polyvinyl chloride (PVC) Resin, plasticizer and various additives as raw materials. It can be used for insulation Encasement of electrical and electronic components, Encasement of general items and Encasement of contact food, etc. The reference standards include plastic tensile test methods, power frequency breakdown voltage of solid electrical insulating materials, breakdown strength and voltage resistance test methods, etc.