... chemical ingredient Al2O3, its content is between 94.5% and 97%, and the other containing a small amount of Fe, Si ... , ceramics, iron-smelting furnace of the lining (walls and tubes); physical and chemical containers , spark plugs, heat-resistant anti-oxidation ... preservation material , such as lightweight corundum brick, corundum hollow ball and fiber products, widely used in a variety of high- ...