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.

PropertiesUNITLimit ValueTypical Value
Maximum Hot Face Temperature°C15501550
Bulk Densitygm/cc2.60 min.2.65
Apparent Porosity%16.0 max.14.5
Cold Crushing StrengthKg/cm2800 min.900
Modulus of Rupture   
At Room TemperatureKg/cm2
At 1250°CKg/cm2
Thermal Conductivity At 1000°C Hot Face TemperatureW/m°K
Chemical Analysis   
SiC%90.0 min.91.05
Al2O3  %3.0 max.2.55
Fe2O3   %0.95 max.0.8
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