... ,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material: bimetallic layer PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine ... .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC,PMMA,POM,PAST,PET,PBTNitride Depth0.5mm-0.8mmTechnology1)Longer ... -3.5mmWarranty period:2-4years(Depends on the plastic raw materials)Bimetallic: much longer lifetime.Nitriding timeOver 180 hours