... oxide, dull grain shape, top high toughness Description:AETL is a very tough brown fused aluminum oxide abrasive ... carefully to get a complete range of grit sizes. It is used for making vitrified bonded ... Knoop scale, 9.0 Mohs scaleMagnetic Material 0.0076%Grain Sizes Available (F):12, 14, 16, 20, 22, ... :2006 or ISO 8486-1Key words:Brown fused alumina, brown corundum, brown aluminium oxide, artificial ...