... -4um use for ceramics,refractory,polishing Product DescriptionCalcined Alumina Appearance: White powder Material: A-AL203 Grade ... property 7. Outstanding resistance to corrosion Property: Calcined Alumina is white powder, good flowability, performance stability, ... wear-resisting, corrosion-resisting products, such as high alumina refractory products, strong ceramics, high grade abrasive, electromagnetic ...