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Rifeng multilayer Pipes is composite pipe of five layers, inside and outside layers of which are made of Hight-Density polyethylene(HDPE) Cross-Linked(PEX) or Polyethylene Raised Temperature(PE-RT) , tightly bonded with melt adhesive to the mid-layer of aluminum core which is longitudinally welded in an overlapping way. All layers are extruded by one step.

Rifeng Multilayer Pipes' inside and outside layers are of special PE, Hygienic, toxic-free and smooth, its middle layer of AL is 100% of gas/oxygen tight, giving it advantages of both metal and plastic pipes, but eliminates their own disadvantages.