... (120 Hours):Depth of Nitrided Layer: 0.5-0.8 mmHardness of Nitrided Layer: 900- ... :≤Two classMaterial Application1)General Plastics2)ABS,PA,PC,PE,PET,PP,PS,EVA,PU,PVC, ... + 30% CaCo3, etcQuality Certificate: •100%Quanlity InspectionAs the screw and barrel are the important parts for plastic ... screw barrel12.Blocks screw13.Gear box14.screw barrel for blowing molding machine 1, Conical twin screw extruder ...