... bauxite as main material, fusing and purifying in a pouring electric arc furnace at a temperature of over 2200 celcius degree, and ... Density3.90g/cm3 minMohs Hardness9Micro HardnessHV1800-2200 Size Available: Abrasives F12-F1200,P12-P2500Refractory 0-1mm,1-3mm,3-5mm,5-8mm ... including low cement castables,plastics,bricks etc. Brown fused alumina / A for Abrasives and Refractory