Bubble Alumina Bricks,they may be used both as insulating and working linings of high temperature kilns. Bubble Alumina BricksITEMTYPICAL INDEXAl2O3 % ≥99.30SiO2 % ≤0 ... purity, good inslutation property, high strength, good abrasive resistance, and good thermal shock resistance, etc., which can be used for insulation with ...