... .stable quality 4.large output quantity Description:A-20B is a kind of Brown Aluminum Oxide abrasive specially ... producing for sandblasting, polishing applications.Applications:A-20B is mainly used in the removal of oil ... 2090 Knoop scale, 9.0 Mohs scaleGrain Sizes Available (F):12, 14, 16, 20, 22, 24, 30, 36, ... 220, 240Grain Size Distribution :Loose grain. Sandblast material A-20B