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CUMIFRAC 90 (Silicon Carbide Rrefractories

Silicon Carbide Refractories (CUMIFRAC 90) are produced from silicon carbide, a raw material synthesized in a resistance-type electric furnace at temperature exceeding 2500°C, through the reaction of silica with carbon. They have a thermal conductivity 10 times that of fireclay refractories, good corrosion and thermal shock resistance, and can be formed into complex shapes. They can withstand attack and flame erosion. This makes CUMIFRAC unusual even among advanced refractories and has given it wide uses.


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  • H.T. Insulators / Ceramics
  • Sanitaryware
  • Ferro Alloys
  • Foundries, Forge Plants, Powder metallurgy


  • Extremely high thermal conductivity
  • Very high hot strength
  • High erosion and abrasion resistance
  • Thermal shock resistance
  • Chemical inertness


  • Kiln furniture
  • Muffles and chamber fronts
  • Taphole linings
  • Heat treatment furnace hearth


Properties UNIT Limit Value Typical Value
Maximum Hot Face Temperature °C 1550 1550
Bulk Density gm/cc 2.60 min. 2.65
Apparent Porosity % 16.0 max. 14.5
Cold Crushing Strength Kg/cm2 800 min. 900
Modulus of Rupture      
At Room Temperature Kg/cm2
At 1250°C Kg/cm2
Thermal Conductivity At 1000°C Hot Face Temperature W/m°K
Chemical Analysis      
SiC % 90.0 min. 91.05
Al2O3 % 3.0 max. 2.55
Fe2O3 % 0.95 max. 0.80