... chemical stability,good smoothness, mechanical seal good, and so on.Property ItemsUnit95%Al2O399.5%Al2O3Densityg/cm33. ... ,Wearlessness,resistant acid-base and high intensity ceramic assembly apply to petroleum ,chemical and chemical industry. 4,Wearlesness ... , Tolerance, Surface Roughness, Concentricity, Perpendicularity and other specification are upon your requirements. Alumina ceramic pump sleeve ...