... and compressionratio can be designed accordingto different products &different mixtrues. Standard SpecificationsISO9001Advantages1.Long time ... ridge,and uses different alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS ... SACM645)SKD61 .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC,PMMA,POM,PAST,PET ...