PP-R heat tracing antifreeze pipe is composed of polyethylene outer protective pipe, polyurethane foam insulation layer and plastic working pipe (PPR or PE-RT).The insulation effect is 4-9 times higher than that of other pipes.Moreover, due to the closed pore rate of polyurethane foam is as high as 92%, its water absorption rate is very low.Low thermal conductivity and low water absorption, coupled with insulation layer and outside waterproof performance of polyethylene pipe, greatly reduce the overall heat loss of the pipe, heat loss of the heat network is 2%, far less than the standard requirements of 10%.In addition, PP-R heat tracing antifreeze tube in PPR insulation tube on the basis of added heat tracing function, to ensure that the fluid does not freeze.