... .CF-16 is a black, friable, medium bulk density silicon carbide abrasive grain. To get this kind of grains, we specially ... 0..33%Physical Properties:Color BlackShape AngularCrystal Form Alpha silicon carbide in hexagonal systemSpecific Gravity 3.21Hardness 2750 kg/mm, 9 ... , 320, 360, 400, 500, 600, 800, 1000, 1200. Black Silicon Carbide used for Ceramic