... insulation; Long life span; Environmental, healthy; Economical, Light weighted. pp-r fittings: ppr elbow 45 degree Application Area:1. Cold and ... compared with steel and copper pipes.Type of MaterialsThermal conductivityUnitPP-R pipes0.21-0.24w/mkSteel pipes43-53w/mkCopper pipes333w/ ... During the process of production, construction and use, PP-R pipes will not make any pollution to the environment.6 ...