cod pipe making machine, 1.have passed the ISO 9001 2000 2.CE ... .short delievery time. 4.better service COD pipe and machine 1)corrugated/spiral shape 2)co-extrusion forming 3)3 ... Resulttest dataconclusion1. Outshapeinner/outer wall smooth, color evenly, no bubble, no cracks, no impurity,no decomposition linepassgrade2. Structure and ... 0.198grade9.length shrinkable %≤31.7grade cod pipe and machine