Asia corundum corundum is based on the production of high quality, it is high quality bauxite made directly from a high-purity fused corundum, its toughness, which was low porosity. Because of its chemical composition and physical properties are close to white corundum, hence the term sub-white fused alumina. The product has a hardness of white fused alumina, corundum with both toughness, is ideal for advanced refractory and abrasive materials. Bulk Density ≥ 3.8g/cm, refractoriness ≥ 1850 ℃. I produced the sub-white fused alumina sand, differential (pickling) in precast refractory to do has not detonate, does not crack, not powder characteristics