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Cross-linked polyethylene (PEX) is a high-temperature, flexible, polymer pipe. Cross-linking technology was first. developed in Europe 35 years ago and has been used. around the world for a variety of applications. PEX pipe was introduced into the North American market. in 1984 due to the success in Europe with extensive testing. for durability and material performance. The PEX piping industry is highly regulated. The letter. designations of PEX Pipe are not related to any type. of rating system.