Alumina hollow ball is a new type of high-temperature insulation material, it is made of Al2O3 with more than 98%, then melting in a three-phase arc furnace, to melt the liquid alumina by compressed air. Sphere is crystallized as a-Al2O3 micro-crystals. Alumina hollow can be made into a variety of shapes, the maximum temperature is 1800 ℃, with high mechanical strength, it is several times for other general light productions, while the bulk density is only half of corundum.
