Manufactured from pure quartz sand and industry alumina in super-large electric arc furnace.. Fused Mullite has a high content of mullite crystals which confer high melting point ,excellent themal stability, low reversible themal expansion and resistance to themal shock and chemical corrosion at high temperature. It is widely used as lining bricksin glass body kiln and large hot wind furnace in iron-making blast furnace, as well as in ceramic liln and petrochemistry.