Fused Mullite

Fused Mullite is manufactured by fusing a mixture of high purity Bayer Alumina and pure Quartz in a tilting type arc furnace at a temperature around 2000 deg C. Controlled cooling of the molten mass ensures a high degree of mullitization characterized by well-defined columnar crystals. It has a high content of needle-like mullite crystals which confer high melting point, low reversible thermal expansion and excellent resistance to thermal shock, deformation under load, and chemical corrosion at high temperatures.