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Cross-linked polyethylene (PEX) is a form of polyethylene with cross-links. It is made by a process that forms links between polyethylene molecules to create bridges (thus the term "cross-linked). This resulting material is more durable under temperature extremes, chemical attack, and better resists creep deformation, making PEX an excellent material for hot water and other applications. It doesn’t corrode or develop pinhole leaks, is chlorine-resistant, scale-resistant, and has fewer fittings, connections, and elbows than rigid plastic and metallic pipe. <big>Cross-linked polyethylene (PEX) is a form of polyethylene with cross-links.</big> [[Image:PEX-tubing.jpg]] PEX is made by a process that forms links between polyethylene molecules to create bridges (thus the term "cross-linked). This resulting material is more durable under temperature extremes, chemical attack, and better resists creep deformation, making PEX an excellent material for hot water and other applications. It doesn’t corrode or develop pinhole leaks, is chlorine-resistant, scale-resistant, and has fewer fittings, connections, and elbows than rigid plastic and metallic pipe.