Alumina hollow bulb brick / Alumina bubble brick is made of alumina hollow ball as the main raw material, corundum ultrafine powder as additive, organic material as binder, after forming and drying process, and finally fired in 1750℃ high temperature kiln. It belongs to the category of light corundum insulation brick, this material has both low thermal conductivity of insulation brick, and high compressive strength, It is a light thermal insulation brick that can be used normally at 1700℃. Alumina hollow ball brick has excellent high temperature resistance and heat insulation performance, can be directly used as the working lining of high temperature furnace, for reducing the weight of furnace body, reforming the structure, saving materials, saving energy, will achieve obvious results.