1.Precision notching and deburring 2.Wear resistance 3.Anti-corrosion 4,Custom design 5,Eco-friendly,favourable ... chemical stability,good smoothness, mechanical seal good, and so on.Property ItemsUnit95%Al2O399.5%Al2O3Densityg/cm33. ... Tolerance, Surface Roughness, Concentricity, Perpendicularity and other specification are upon your requirements. Custom design Alumina ceramic hydraulic pump shaft