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Typical Product Specification of Indian Refractories - High Alumina 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.

HIGH ALUMINA BRICKS
CHEMICAL PROPERTIES 

Al 2 O3 (%) 
98.4 - 99.0 
85 - 88 
SiO 2 (%) 
0.5 - 0.7
8.0 - 10.0 
Fe 2 O3 (%) 
0.05 - 0.07 
1.0 
PHYSICAL PROPERTIES 

Hot Face Temperature (°C) (Max) 
1870 
1650 
Bulk Density (gm/cc) 
2.8 - 3.0 
2.6 - 2.85 
Apparent porosity (%) 
18 - 23 
17 - 22 
Cold Crushing Strength (kg/cm²)
550 - 650 
700 - 900 
Modulus of Rupture (kg/cm²) at room temp.
180 - 200 
150 - 175 
Reheat change (%) (Max) at 1450&°C for 6 hrs. 
±0.1 
±0.3 
Thermal conductivity (w/m°K) at 1000°C Hot Face temp. 
3.0 
4.1 
Spalling Resistance 
Fair 
Good

BAUXITE BASED HIGH ALUMINA BRICKS
CHEMICAL PROPERTIES 

Al 2 O3 (%) (Min) 
70 
80 
Fe 2 O3 (%) (Max) 
3.0 - 3.5 
PHYSICAL PROPERTIES 

Pyrometric Cone Equivalent (Orton) (Min) 
36 
37 - 38 
Apparent porosity (%) (Max) 
23 
23 
Bulk Density (gm/cc) (Min) 
2.6 
2.7 
Cold Crushing Strength (kg/cm²) (Min) 
400 
400 - 500 
PLCAR (%) (Max) at 1600°C for 2 hrs. 
+3 
+1.5 
Remarks  High Alumina bricks resistant to alkali and slag attack, suitable for burning zone of Cement rotary klin ladle lining and EAF

 

 

     
 
 

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