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Fused Mullite

Fused Mullite is produced by electric furnace fusion of high purity alumina and high purity silica.

Refractory Raw Material - Fused Mullite

Fused Mullite is a needle-like alumina-silica grain that has great features including:

  • Low conductivity
  • Excellent thermal shock resistance
  • Excellent resistance to deformation under load
  • Fused Mullite is used in applications such as refractories for glass and steel industries, kiln furniture, investment casting as shell building materials, spark plug bodies, and many other applications.

    Contact KT Refractories for Fused Mullite, refractory mullites, or other refractory raw material because we save you time and money!

    Call us at 1-877-365-2995 or email us at for your refractory raw material, chemical additives or minerals need!

    Fused Mullite Data Sheet:



    Guaranteed value Typical value
    Chemical Composition (%) Al2O3 70-77 75.30
    SiO2 22-29 24.08
    Fe2O3 ≤0.1 0.05
    R2O3 ≤0.5 0.18
    RO ≤0.3 0.28
    Mullite phase 3Al2O3 2SiO2 (%) ≥95
    Glass phase (%) ≤5
    Linear expansion coefficient (1/°C) -6.0×10-6
    Density of volume (g/cm3) ≥3.0
    Refractoriness (°C) ≥1840
    Grain size (mm) 5-3 3-1 1-0
    Color White or Grey
    Test standard KTB01006-2003
    Packing 25 kg/plastic bag 1000 kg/plastic bag at buyer's option