PPR aluminum-plastic composite pipe is abbreviated as aluminum-plastic pipe (PAP), which is made of polyethylene (PE) or cross-linked polyethylene (PEX) as the inner and outer layers. The adhesive is bonded to the plastic layer, and the pipe is formed by one-time molding or double-molding composite process. Since 1992, the average annual growth rate of aluminum-plastic pipes in Europe has exceeded 20%. Compared to other pipes used in tap water systems, its growth rate is the highest.
