... corrugated pipe toughness good.HDPE double wall corrugated pipe, high crushing bear. Responsibility for the performance of HDPE double ... has a happy clean environment, energy, health, good sealing performance, corrosion resistance, shake resistance, good quality, cheap, easy to install ... delaminationConformedOven testno and drying crackConformedCreep rate,%≤20.46% High quality HDPE corrugated pipe