... as concrete, steel, cast or ductile Rongan HDPE Pipe for Water Supply Nowadays, polyethylene piping is a ... ductile iron, and even PVC.We see the HDPE pipe a broad utilization from pressure-rated potable water ... Wear-resistance, Impact-resistance.6) Small resistance means pipe is slick inner wall. Low construction cost.7 ... of PVC. In practical terms, this means HDPE pipe shrinks 10 times as much as DI and ...