Polycrystalline alumina continuous fiber is a high-performance fiber material with high strength, hardness, high temperature resistance, and chemical corrosion resistance. Mainly composed of alumina (Al2O3) and other additives, it is usually subjected to high-temperature sintering treatment to improve its strength and stability. It can be made into various shapes and sizes according to different diameters and lengths, such as fiber felt, boards, pipes, etc.