Fused Mullite

Fused Mullite, manufactured by Washington Mills, is produced by the electric furnace fusion of Bayer process alumina and high purity silica. The result is a needle-like alumina-silica grain that has low conductivity, excellent thermal shock resistance, and excellent resistance to deformation under load.


  • refractories for glass and steel industries
  • kiln furniture
  • investment casting 
  • shell building materials
  • spark plug bodies