CUMILOX High Alumina refractories are produced from fused and sintered alumina for high purity range from 85 – 99.5% alumina. Calcined Bauxite, Chamotte, etc. are used for 85% alumina and below. High purity alumina, being a stable oxide, is inert to corrosive attack in oxidizing atmospheres and can also withstand highly reducing atmospheres. It can also withstand high temperature hydrogen attack and is indispensable in applications which encounter hydrogen attack. CUMILOX possesses all these inherent characteristics of alumina and more.


  90% Alumina, Fused alumina with secondary mullite bond
PROPERTIESUNITLimit ValueTypical Value
Maximum Hot Face Temperatureo C16501650
Bulk Densitygm/cc2.953
Apparent Porosity%1817
Cold Crushing StrengthKg/cm210001050
Modulus of RuptureKg/cm2  
At Room Temperature 175190
At  1250o C 
Reheat Change %  
After heating at 1450°C for 6 hrs.  +/-0.5at1600°C/2 hrs.
Thermal ConductivityW/m K  
At 800o C Hot Face Temperature 2.9 max.2.75
At 1000o C Hot Face Temperature 2.7 max.2.65
At 1200o C Hot Face Temperature 2.8 max.2.65
Chemical Analysis %   
Al2O3 89.0 min.90.65
SiO2 10.0 max.8.75
Fe2O3 0.30 max.0.21
Recommended Laying Mortars CUMIBOND LA 282 
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