... as the quantity of ZrO increases.3. Only no harder than Boron carbide and Diamond, friable, its ... size, abrasive material, grain, grade, , and speed SpeciesCode 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, ...