GB/T 28799.2-2020 standard specifies the pipe requirements for heat-resistant polyethylene (PE) (PE-RT) piping systems for hot and cold water. This standard applies to PE-RT piping materials used in indoor hot and cold water supply systems, including its classification, material structure, Appearance mass, size and tolerance, mechanical properties, heat resistance, heat aging performance, chemical performance, environment stress cracking performance, etc. The standard emphasizes that the manufacture and use of piping materials should comply with the requirements of relevant national laws and regulations to ensure the safety, Reliability and performance Stability of piping systems during long-term use.