... good 3.Polishing surface 4,Shaped as your designing and requirement 95%--99% AL2O3 ceramic bushing, ceramic plunger ... tell me.Dimension, Tolerance, Surface Roughness, Concentricity, Perpendicularity and others. Main applications: The enterprises of Eletricity ,smelt,mechanism, ... of coal transfer,material transfer,milling,dust removing,and so on. PropertyItemsUnit95%Al2O399.5%Al2O3Densityg/cm33.73 ...