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Typical Product Specification of Indian Refractories - Silica 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.

COKE OVEN SILICA BRICKS (as per DIN 1089 Part-1)


Regenerator
Oven walls
Oven roof
Oven walls Oven Sole
CHEMICAL PROPERTIES 



SiO2 (%)
>=94.5 
>=95 
>=95 

1.0 
1.0 
1.0 
Al 2 O3 (%) 
<=2.0 
<=1.5 
<=1.5 

0.3 
0.3 
0.3 
Fe 2 O3 (%) 
<=1.0 
<=1.0 
<=1.0 

0.2 
0.2 
0.2 
CaO (%) 
<=3.0 
<=3.0 
<=3.0 

0.35 
0.35 
0.35 
Na 2 O+K2O (%) 
<=0.35 
<=0.35 
<=0.35 

0.02 
0.02 
0.02 
Residual quartz content 



Raw material type A (%) 
As per mutual agreement 
(coarse crystalline) 
Max 6.0 
Raw material type B (%) 
1.5 


(coarse crystalline) 
0.5 


PHYSICAL PROPERTIES 



Cold Crushing Strength (N/mm²) 
>=28 
>=35 
>=45 

10 
10 
10 

Min 
20 
25 
30 
Apparent porosity (%) 
<=24.5 
<=22.0 
<=22.0 

1.3 
1.3 
1.3 
Refractoriness under load (DEFta°C) 
>=1640 
<=1650 
<=1650 

25 
25 
25 
Creep in compression 5-25 hrs. (%) 
<=0.12 
<=0.12 

0.05 
0.05 
Refractoriness (SK) 
31 

0

COKE OVEN SILICA BRICKS (as per DIN 1089 Part-1)


Regenerator
Oven walls
Oven roof
Oven walls Oven Sole
CHEMICAL PROPERTIES 



SiO2 (%)
>=94.5 
>=95 
>=95 

1.0 
1.0 
1.0 
Al 2 O3 (%) 
<=2.0 
<=1.5 
<=1.5 

0.3 
0.3 
0.3 
Fe 2 O3 (%) 
<=1.0 
<=1.0 
<=1.0 

0.2 
0.2 
0.2 
CaO (%) 
<=3.0 
<=3.0 
<=3.0 

0.35 
0.35 
0.35 
Na 2 O+K2O (%) 
<=0.35 
<=0.35 
<=0.35 

0.02 
0.02 
0.02 
Residual quartz content 



Raw material type A (%) 
As per mutual agreement 
(coarse crystalline) 
Max 6.0 
Raw material type B (%) 
1.5 


(coarse crystalline) 
0.5 


PHYSICAL PROPERTIES 



Cold Crushing Strength (N/mm²) 
>=28 
>=35 
>=45 

10 
10 
10 

Min 
20 
25 
30 
Apparent porosity (%) 
<=24.5 
<=22.0 
<=22.0 

1.3 
1.3 
1.3 
Refractoriness under load (DEFta°C) 
>=1640 
<=1650 
<=1650 

25 
25 
25 
Creep in compression 5-25 hrs. (%) 
<=0.12 
<=0.12 

0.05 
0.05 
Refractoriness (SK) 
31 

0

SILICA BRICKS FOR BLAST FURNACE STOVES
CHEMICAL PROPERTIES 
SiO 2 (%) (Min) 
95 
Fe 2 O3 (%) (Max) 
Al 2 O3 (%) (Max) 
0.7 
TiO 2 (%) (Max) 
0.2 
CaO (%) (Max) 
Alkalies (%) (Max) 
0.2 
Free quartz (%) (Max) 
Avg.
0.75 
Retesting required if more than 
Absolute 
1.5 
PHYSICAL PROPERTIES 
Bulk Density (kg/m³) (Min) 
1800 
Apparent porosity (%) (Max) 
21 
Cold Crushing Strength (N/mm²) (Min) 
30
Refractoriness under load (2 kg/cm²) (ta°C) (Min) 
Permanent linear change (%) (Max) 
Avg. < 2.0 

Avg. > -0.2 
Pyrometric Cone Equivalent (°C) (Min) 
Specific Gravity (gm/cc) (Max) 
2.34 
(Min) 
2.30 
Creep (%) (0.2 N/mm²) (Max) at 1500°C for 20-50 hrs. 
0.2

 

 

     
 
 

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