... PE100 2.Sizes: 200 to 800mm 3.Pressure Rating: 0.4MPa, 0.6MPa, 0.8MPa, 1.0MPa, HDPE double wall corrugated pipeHDPE ... surface, ladder-shaped corrugated surface and an empty layer between double surfaces. With its unique wall structure design, such pipe has ... other material pipes.According to different ring stiffness grades,HDPE double wall corrugated pipe falls into S1(ring stiffness≥4KN/m2 ...