Cross-linked polyethylene
![A cross-linked polyethylene (PEX) pipe](/Images/godic/202501/17/PEX-Rohr5811.jpg")
![Raw material: XLPE powder used in rotational molding in a factory](/Images/godic/202501/17/XLPE_powder_in_mold_used_in_Rotational_Molding_by_Roto_Dynamics_Inc5811.jpg")
![Radiant heating system manifold using PEX tubing](/Images/godic/202501/17/Col.lector_terra_radiant5811.JPG")
![PEX's flexibility means fewer connections, better water flow, faster and easier installations.](/Images/godic/202501/17/PEX_piping_bending_in_a_basement5812.jpg")
Cross-linked polyethylene, commonly abbreviated PEX or XLPE, is a form of polyethylene with cross-links. It is formed into tubing, and is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, and insulation for high tension (high voltage) electrical cables. It is also used for natural gas and offshore oil applications, chemical transportation, and transportation of sewage and slurries. PEX has become a common alternative to polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC) or copper tubing for use as residential water pipes.