... holdout, 3.durable, 4.stronger flexibility than WA, 1.carborundum grinding wheel cover various specifications of vitrified abrasives with the diameter less ... than Boron carbide and Diamond, friable, its girt is sharp, and Thermal conductivity4 Suitable for grinding Hard alloy, Optical glass, vitrify, gem, agate ... weak Tensile strength metallic and Nonmetallic material, i.e. carborundum grinding wheel