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Typical Product Specification of Indian Refractories - Insulating Bricks

Some typical specifications of Indian refractories commonly used in the furnaces and kilns in steel, cement, non-ferrous metals and glass industries are given below. These are illustrative and do not cover the full range of products and some of the improved items which have been recently developed.

INSULATING BRICKS
CHEMICAL PROPERTIES 
Al2O3(%) (Min) 
96 
SiO 2 (%) (Max) 
1.5 
Fe 2 O3(%) 
0.2 
PHYSICAL PROPERTIES 
Hot Face Temp. (°C) (Max) 
1850 
B.D. (gm/cc) (Max) 
1.5 
C.C.S. (Kg/cm²) (Min) 
60 
Permanent Linear Change (Max) at 1450°C for 24 hrs. 
±0.5 
Thermal Conductivity (W/mk) 
at Hot Face Temp. 800°C 
1.22 
at Hot Face Temp. 1000°C 
1.33 
at Hot Face Temp. 1200°C 
1.50

HIGH TEMPERATURE INSULATING BRICKS
CHEMICAL PROPERTIES 



Al2O3(%) (Min) 
60 
70 
85 
90 
Fe 2 O3 (%) (Max) 
1.0 
0.7 
0.7 
0.6 
PHYSICAL PROPERTIES 



Service Temperature (°C) 
1550 
1650 
1750 
1800 
B.D. (gm/cc) (Max) 
1.1 
1.2 
1.4 
1.5 
C.C.S. (Kg/cm²) 
50 
50 
50 
70 
PCE (Orton) (Min) 
37 
37 
38 
38 
PLC (%) 



at 1550°C for 5 hrs.
+0.8/-0.2 



at 1600°C for 5 hrs. 
+1.0/-0.2 


at 1650°C for 5 hrs. 

+1.0/-0.2 
+0.8/-0.2 
Thermal Conductivity (Kcal/M/hr/°C) 
(Max) at 800°C HF 
0.4 
0.42 
0.6 
0.7

 

 

     
 
 

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