... alumina is made by high-quality bauxite as main material, fusing and purifying in a pouring electric arc ... , polish wax, abrasive paste, coating etc..2) Refractory material: Mainly used for abrasion and high temperature resiatant, inoxidizable ... furnace etc..3) Sandblasting abrasive: Mainly used for various material workpieces to decontaminate, derusting, prevent corrosion, remove oxide skin etc.. ...