Composition: Inner working pipe+ polyurethane insulation layer + outer HDPE protection pipe (the inner working pipe can be steel pipe, HDPE pipe, PVC pipe or as request) Medium temperature 50-120℃,max:140(284℉) Working pressure 2.5MPa Working lifetime 30-50years PU foam density ≥60kg/m3 Water absorption ≤10% Thermal conductivity ≤0.033W/(m*k) Application For district central heating and cooling For hot