SKDsereries screw barrel for plastic wpc made in china 1.Material:SKD11,SKD61 2.Designed for plastic WPC SKDsereries screw barrel for plastic wpc made in china Conical Twin Screw ... of nitration HV800-1050 Depth of double alloys 0.8-2.0mm Hardness of double alloys HRC56-65 Screw Main ... : PVCwood-plastic., PE wood-plastic,,Super high polymer board,1/2 high Calcium buckle,50-400 high Calcium pipe,50-300 ...