DURAMUL®is a high purity, fused mullite produced by the electric furnace fusion of Bayer process alumina and high purity silica. There is an excess of aluminum oxide above the normal mullite ratio (3 Al2O3 : 2 SiO2) to ensure that all of the SiO2 is contained within the mullite phase and is not present in the glass phase. DURAMUL®receives high intensity magnetic treatment to remove virtually all the magnetic iron present.



  • manufacture of refractory products where hot strength, resistance to spalling, and low thermal conductivity are important factors
  • kiln furniture
  • ladles