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Cross-linked polyethylene (PEX) pipes used in hot water supply are required for high mechanical strength and high creep resistance at high temperature. PEXa pipes which are made by peroxide cross-linking have better performance, such as creep resistance and thermal shock resistance than the pipes made by other cross-kinking method. Finished PEXa pipe can be coated with EVOH oxygen barrier and other protection layer, by another separate extrusion line, to get a 3 layer PEXa EVOH oxygen barrier pipe or 5 layer PEXa EVOH oxygen barrier pipes. The three layer PEXa oxygen barrier pipe strucrues are： PEXa pipe, adhesive layer, and outer EVOH oxygen barrier layer. However the five PEXa oxygen barrier pipe structures are: inner PEXa pipe, adhesive layer, Middle EVOH oxygen barrier pipe, Adhesive layer, and outer PE protection layer.
