The impurities in white corundum have a significant impact on its service life. The main impurities contained in the production process of white corundum are SiO2, Fe2O3, and TiO2. The fewer impurities, the higher the quality of white corundum. The content of AL2O3 in white corundum directly indicates the quality of white corundum.

When white corundum is used as a refractory material, the impurities it contains can affect its refractory performance. Impurities in refractory materials can be either easily melted or have a high melting point, but when coexisting with the main components, they can produce easily melted materials. The presence of impurities often has a strong melting aid effect on the main components. Although the fluxing effect sometimes helps with the liquid-phase sintering of materials, it poses a serious threat to the material's resistance to high temperatures.

White corundum is mainly used as an abrasive. In recent years, it has been widely used in refractory materials, such as iron hook castables, anhydrous foam mud, steel jade bricks, prefabricated parts, permeable bricks, ladle bricks, magnesium aluminum carbon bricks, etc.

The advantages of white corundum used in refractory materials are high refractoriness, wear resistance, erosion resistance, high bulk density, and high alumina content. It is mainly used in high alumina and alumina systems. When making products, there are also high load softening temperatures and high temperature volume stability. The impurities in white corundum determine the lifespan of the product during use. Due to the incomplete removal of impurities during smelting, white corundum still contains sub crystalline phases such as calcium hexaaluminate, plagioclase, spinel, and rutile, as well as glass phases, ferroalloys, and solid solutions.

White corundum is refined from three materials: carbon, alumina, and iron filings. Due to the presence of iron filings, high-quality white corundum should appear brownish yellow. Observing the color is one way to distinguish white corundum. Tri alumina is one of the substances that make up white corundum, and the content of tri alumina directly affects the quality of white corundum. White corundum is divided into three grades, among which the best is first grade white corundum, followed by second and third grade. The quality standard of white corundum mainly depends on the content of AL2O3, and those with a content of over 95% are first grade white corundum. The content of second and third grade white corundum gradually decreases, and the quality also decreases accordingly.