1. High-purity alumina content 99.3% -99.5%, other alumina ceramics 92% -99%. 2. The color of high purity alumina product is milky white, and other products are pink or white. The higher the purity, the more transparent the color. 3. Alumina is a refractory material, the higher the purity, the better the refractory effect 4. After high-purity alumina ceramics are fired and cooled in a 1800-degree high-temperature kiln, the products are not easy to break when they encounter high temperatures. Other ceramics are fired at 1500 ℃ ~ 1800 ℃.