Polycrystalline Alumina Fibers

Slow Cool Cover

MAFTEC™ was developed in the 1980’s by Mitsubishi Plastics Inc., for long term, high or cyclic temperature operation. MAFTEC™ “Polycrystalline Alumina Fibers”, exhibit excellent thermal stability, resiliency, erosion resistance and mechanical strength at temperatures to 1600°C – 2912°F.

MAFTEC™ is a Mullite fiber.  Mullite is a stable material that does not change molecularly through the temperature range, up until it melts (1850°C).  The silica in MAFTEC™ is contained within the structure of Mullite and is not allowed to form free silica.  MAFTEC™ fiber diameter averages 5 microns.

Click to View STELBOLT® Video


  • Extremely low shrinkage-1% at 1400°C-2552°F. 1 1/2% at 1600°C-2912°F
  • Extreme Weight Reduction-lining densities of 8-10#/cu.ft. compared to monolithic of 150-160#/cu.ft.
  • Weight and thickness tolerances to ensure value
  • Total Thermal Shock Resistance
  • Resiliency Performance-to 1300°C
  • Service temperature range-up to 1600°C-2912°continuous
  • Installed easily and quickly in all temperature environments
  • 1% shrinkage at 1400°C
  • Higher Tensile Strength-maintaining lining integrity
  • Low, Low, Low shot content due to manufacturing technology

Industries Served

  • Zinc
  • Refining
  • O.E.M. Furnace Builders
  • Die-Casting
  • Steel
  • Primary Aluminum
  • Non-Ferrous
  • Cremation
  • Secondary Aluminum
  • Precast
  • Mineral Processing
  • Chemical
  • Rock Products
  • Power Generation
  • Incineration
  • Boiler Manufacturing


Reheating Furnace

Tremendous Weight Reduction