white fused alumina electrically fused in arc furnace high grade ... hardness and lower toughness Description:WAMIC is a kind of white fused alumina electrically fused in arc furnace with high grade ... 2150 Knoop scaleMagnetic Material 0.0025%Microgrit Sizes Available :FEPA “F” 230, 240, 280, 320, 360, 400, 500, 600, 800, ... 800, 1000, 1200, 1500, 2000, 2500, 3000, 4000, 6000, 8000. White Aluminum Oxide