... as the quantity of ZrO increases.3. Only no harder than Boron carbide and Diamond, friable, its ... , size, abrasive material, grain, grade, , and speedSpeciesCode No.colorfeaturesselectionbrown fused aluminaATanhigh rigidity, strong flexibility, low price, can ... for form grinding, knives, Measuring instrumentGreen silicon carbideGCgreenOnly no harder than Boron carbideSuitable for grinding Hard alloy, ...