... ,220V ,50Hz13. Installation, parallel extrusion installation.14. Precision of polishing,Polishing precision of the stream surface of the die lip 0.03-0.04(um ... .04-0.05(um)15.Galvanization , the stream surface of the die head are treated by chrome treatment. Thickness 0.03-0 ... .04(um),hardness: 60-65Rockwellc,the chrome treatment thickness of the ...