The anti-corrosion layer of extruding PE includes the types of two-layer structure and three-layer structure. For two-layer structure, the bottom is adhesive layer, and the outside is PE layer. For three-layer structure, the bottom is epoxy powder layer, the middle is adhesive layer, and the outside is PE layer.
Standard:GB/T23257-2017
Hydraulic engineering for long-distance water supply, Municipal projects for water supply & drainage, Underground pipeline project etc.