... in all kinds of rubber raw materials, such as: PE, PP, PVC, PS, ABS, PA, POM, PC, PSV, PTFE, PR, UP, PEC, ... : nitriding treatment, alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS, AS etcDepth of Nitrated Layer: 0.5-0.8mmHardness ... to customerized design drawing. The Reference Pictures of Screw Barrel : PE PP PVC ABS PS plastic injection molding machine screw and barrel