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Typical Product Specification of Indian Refractories - Castables & Monolithics

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.

CONVENTIONAL CASTABLES
CHEMICAL PROPERTIES 


Al2O3(%) 
60 - 65 
90 Min 
95 - 97 
SiO 2 (%) 
25-30 
0.2 
Fe 2 O3 (%) 
0.7 
0.8 
0.15 
PHYSICAL PROPERTIES 


Hot Face Temp. (°C) (Max) 
1650 
1750 
1800 
Grain Size (mm) (Max) 
B.D. Dried (g/cc) 
2.2 - 2.4 
2.9 
2.6 - 2.8 
C.C.S. (Kg/cm²)


Dried at 110°C 
350 - 550 
1000 Min 
550 - 650 
Fired at 1000°C 
200 - 250
450 - 550 
Fired at 1100°C 
550 Min 
Fired at 1300°C 
850 Min 
Fired at 1450°C 
300 - 400 
0
700 - 900 
PLC (%) 


Dried at 110°C for 3hrs 
Fired at 1000°C for 3hrs 
-0.2 
±0.2 
Fired at 1450°C for 3hrs 
-0.4 
±0.5 
Fired at 1550°C for 3hrs 
±0.7 
Recomended water addn. (%)
by weight (Legend 1550°C) 
9 - 11 
4 - 5 
8 - 10
 
LOW CEMENT CASTABLES
CHEMICAL PROPERTIES 



Al2O3(%) (Min) 
45.0 
70.0 
90.0 
94.0 
Fe 2 O3 (%) (Max) 
0.8-1.0 
1.5 
1.0 
0.3 
PHYSICAL PROPERTIES 



Refractoriness (Orton) (Min) 
32 
36 
37 
+40 
at temp (°C)
1717 
1804 
1820 
1900 
Maximum Service temp. (°C) 
1550 
1600 
1700 
+1800 
B.D. Dry (gm/cc) (Min) at 110°C 
2.3 
2.7 
3.05 
3.1 
C.C.S. (Kg/cm²) 



at 110°C 
700 
750 
950 
1000 
at 800°C 
800 
800 
1100 
1050 
at 1100°C 
900 
900 
1150 
1100 
at 1500°C 
1000 
at 1550°C 
1000 
1200 
1250 
PLC (%) (Max) 



at 800°C 
±0.2 
±0.2 
±0.2 
±0.2 
at 1100°C 
±0.3 
±0.3 
±0.3 
±0.3 
at 1500°C 
±1.0 
at 1550°C 
±1.0 
±0.6 
±0.5 
% Water required for casting 
4.5 - 5.0 
4.0 - 4.6 
3.5 - 4.0 
3.8 - 4.3 
Maximum grain size (mm) 

 

 

     
 
 

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