... to make the goods. Base Raw Material for screw :38CrMoAlA, A grade, Special alloy is welded on ... the screw arris, prolong life of the screwBase Raw Material for ... pipe, 50-300 high calcium profile, soft PVC sheet, XPS-PVC etc; PP.PE.ABS.PVC.pelletzing, pipe, profile, ... GHII3 nature hard after high temperature Twin Screw and Barrel for Plastic Plate&Sheet -011