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Cross-Linked Polyethylene (PEX)
Introduction
Cross-linked polyethylene (PEX) is a form of polyethylene in which the polymer chains are chemically or physically linked, enhancing its mechanical strength, thermal stability, and chemical resistance. The cross-linking process transforms standard thermoplastic polyethylene into a thermoset material, making it suitable for high-performance applications in plumbing, heating systems, insulation, medical devices, and wire coatings.
PEX has gained widespread adoption due to its durability, flexibility, and resistance to corrosion, scale, and chlorine, offering a reliable alternative to traditional materials such as copper and PVC.
Types of Cross-Linking Methods
1. PEX-A (Peroxide Method)
Formed by introducing peroxide during extrusion, creating the highest degree of cross-linking (~70–85%).