What kind of pipe is ppr insulation pipe?

The scientific name of ppr insulation pipe "ppr insulation composite plastic pipe" consists of three layers: 1. The outer layer is hdpe outer protective tube 2. The middle layer is a polyurethane foam layer 3. The inner working tube is ppr tube. It is a new type of ppr thermal insulation composite plastic pipe jointly developed by "Wanniantong" and "Bao Tong" on 20 1 1. Ppr insulation pipe is acid and alkali resistant, ultraviolet resistant (black hdpe outer protective pipe) and has good insulation effect. The heat loss per kilometer is less than 1%, which is widely used in hot water pipeline systems such as hotels, schools and hospitals. In the pipeline insulation system, in daily life, the insulation materials in household "water heaters" and "refrigerators" are polyurethane insulation layers. The national standard of ppr insulation pipe is CJ/T480-20 15.