1,Alumina brick 2,high temperature resistance 3, low thermal conductivity Alumina brickHollow Alumina sphere bricks are sintered at high temperture after molding using hollow alumina sphere, corundum powder,and calcinedpowders mixed in definite proportion as raw material.Characteristic1,high temperature resistance,2,low thermal conductivity,3,good thermal insulation,4,good chemical stability ( ...