Ritai crosslinking polyethylene (PEX-a)pipe is made of high density polyethylene introduced LG chemical company's XL-1800. The PE-Xa pipe with excellent raised temperature resistant performance and pressure resistant. It can be applied in domestic pipe system for hot and cold water, pipes for supplying cold and hot water for central air conditioner, ordinary conditioner or solar water heater. Pipelines of refrigeration system or water treatment system.