... 4MPa, 0.6MPa, 0.8MPa, 1.0MPa, HDPE double wall corrugated pipeHDPE density polyethylene double wall corrugated pipe is a new type of light-weighed pipes, ... other material pipes.According to different ring stiffness grades,HDPE double wall corrugated pipe falls into S1(ring stiffness≥4KN/m2)and S2 ... testno and drying crackConformedCreep rate,%≤20.46% HDPE double wall corrugated pipe