... .7. Piping networks for solar plants.8. Other pipes in industry and agriculture.Characteristics:1. Well heat resistance ... the process of production, construction and use, PPR pipes will not make any pollution to the environment.6. ... of PP-R pipes is 0.89-0.9g/cm, only 1/8 of the steel pipes, 1/10 of ... copper pipes. The light weight will reduce the ...