CUMILAG 25 (Insulation Refractories)

CUMILAG 25 insulation exhibit unique combination of chemical, mechanical stability and insulating properties. They are suitable for applications at service temperatures ranging from 1250 C to 1850 C. They can be directly exposed to flame, and combustion products.


  • Ceramic, Metallurgical
  • Carbon black
  • Fertiliser
  • Iron & Steel
  • Power generation


  • High temperature kiln hot face & backup lining
  • Back up lining
  • Primary reformer and hydrogen transfer lines back up,Secondary reformer cold face
  • Blast furnace stoves
  • High temperature air pre-heaters

cumilag 25 properties

Physical PropertiesUNITLimit ValueTypical Value
Maximum Hot Face Temperature°C13501350
Bulk Densitygm/cc0.85 max.0.80
Cold Crushing StrengthKg/cm220 min.25
Reheat Change (For 24 hrs.)%-0.5 max. at 1300°C-0.2 at 1130°C
Thermal Conductivity   
At 400°C Hot Face Temp.W/m K0.27 max.0.19
At 600°C Hot Face Temp.W/m K0.30 max.0.22
At 800°C Hot Face Temp.W/m K0.36 max.0.30
At 1000°C Hot Face Temp.W/m K0.43 max.0.35
At 1200°C Hot Face Temp.W/m K
Chemical Analysis   
Al2O3%50.0 min.51.72
Fe2O3%1.0 max.0.8