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, Tabular alumina with secondary mullite bond
PROPERTIESUNITLimit ValueTypical Value
Maximum Hot Face Temperatureo C18001800
Bulk Densitygm/cc2.95 min.3
Apparent Porosity%18.0 max.16
Cold Crushing StrengthKg/cm21100 min.1300
Modulus of RuptureKg/cm2  
At Room Temperature 200 min.250
At  1350o C 150 min.200
Reheat Change %  
After heating at 1450°C for 6 hrs.  +/-0.1 max.-0.05
Thermal ConductivityW/m K  
At 800o C Hot Face Temperature 2.9 max.2.4
At 1000o C Hot Face Temperature 2.7 max.2.23
At 1200o C Hot Face Temperature 2.8 max.2.27
Chemical Analysis %   
Al2O3 88.0 min.90.38
SiO2 11.0 max.8.6
Fe2O3 0.20 max.0.13
Recommended Laying Mortars CUMIBOND LA 282
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