... of grains, we specially process the ingots, separate the magnetic material, and sieve the grains carefully to get a complete range of ... grains, it is widely used for pressure blasting, surface finish and other general industrial applications.Typical Chemical Analysis:Al2O3 96.08 ... Gravity 3.95Hardness 2090 Knoop scale, 9.0 Mohs scaleMagnetic Material 0.0076%Grain Sizes Available (F):12, 14, 16, 20 ...