... 8DN<400mm400mm≤DN<600600mm≤DN<700DN≥800mm380N510N760N1020N1.Safeand reliable plastic pipe ring stiffness compared with the pure, easy to enhance ... than cement pipes 20 to 30% polyethylene (PE) pipe wall is smooth, low friction coefficient, and sediment accumulation ... produce, the friction is almost constant after long-term use3.Flexible or no leakage (electric welding, butt welding) connection, ...