Product Description Chuangzhi provides shaft sleeves with ceramic coatings using thermal spray technology. Material of Coating: Al2O3, Cr2O3 Main Coating Advantage: Abrasion Resistance Hardness: HV 650--1300 Coating Thickness: 0.15mm--0.25mm Roughness: Ra 0.2--0.4 Other Attributes: Non-toxic and Corrosion Proof The ceramic coating of the shaft sleeves can bear severe wear even in condition of high temperature and high pressure.