... be used in clean drinking water systems. 2, thermal insulation. PPR pipe thermal conductivity coefficient of 0.21w/mk, only 1 / ... 5, easy installation, connection.PPR has good welding properties, pipe, pipe fittings can be used hot-melt and fused connections, easy ... including central heating systems; 2, building heating system, including floor, wall and radiant heating systems; 3, can be directly used ...