... Thermal conductivity3. Suitable for grinding Hard alloy, Optical glass, vitrify, gem, agate, honing cylinder sleeve and ... High-carbon steel,Chromium corundumPAPink,rose-red Sharp cutting, good edges holdout, durableSuitable for form grinding, ... than Boron carbideSuitable for grinding Hard alloy, Optical glass, vitrify and other hard friable materials.Black ... , i.e. single alundum abrasive cutting tool