... ,chrome 3.Wear-proof,long uselife 4.ISO9001-2008 Carbide alloy screw barrel for plastic screw extruder Techincal Advantages ... for the excellent performance on wear-proof.Especially application:Rubber,various high glass fiber, mineral fiber and PPA,PPS, PA6T, ... ,Used for PVC + 30% CaCo3, recylced plastic material,etc Carbide alloy screw barrel for plastic screw extruder DiameterΦ15mm-Φ350mmDesigningScrew ...