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Typical Product Specification of Indian Refractories - Special Products

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.

SLIDE GATE REFRACTORIES

SLIDE PLATES 
SLIDE PLATES 
NOZZLES 
WELL BLOCKS 
CHEMICAL PROPERTIES 



Al2O3(%) (Min) 
88 
88 
90 
MgO (%) (Min) 
95 
SiO 2 (%) (Max) 
1.5 
Fe2 O3 (%) (Max) 
0.2 
0.2 
C (%) (Min) 
2.0  
PHYSICAL PROPERTIES 



B.D. (gm/cc) (Min) 
2.95 
2.85 
3.00 
2.70 
A.P. (Vol. %) (Max) 
19 
19 
20 
19 
MOR (Kg/cm²) (Min) 



at 1400°C 
at 1500°C 
100 
100 
Remarks For Ingot Teeming Ladle  For Continuous Casting Ladle  Nozzles for Slide gate System  Well Blocks for Slide gate System

ZIRCON AND ZIRCON MULLITE BRICKS FOR GLASS INDUSTRIES

ZIRCON BRICKS 
ZIRCON MULLITE BRICKS
CHEMICAL PROPERTIES

Al2O3 (%) (Min)
68 
ZrO2 (%) (Min)
63 
18 
PHYSICAL PROPERTIES 

A.P. (Vol. %) (Max) 
20 
21 
C.C.S. (Kg/cm ) (Min) 
500 
500 
RUL (taC) (Min) 
1600 
1600
 
MULLITE BRICKS FOR GLASS INDUSTRIES
CHEMICAL PROPERTIES
Al 2O3 (%)
70 ± 1
Fe2 O3 (%) (Max)
0.5
PHYSICAL PROPERTIES
Refractoriness (Sk) (Min) at 1800°C
36
B.D. (gm/cc) (Min)
2.55
A.P. (Vol. %) (Max)
18
C.C.S. (Kg/cm² ) (Min)
500
RUL (ta°C) (Min)
1700
PLC (%) (Max) at 1450°C for 2 hrs.
±0.2
 
CONTINUOUS CASTING REFRACTORIES

SHROUD 
MONOBLOCK STOPPER 
SUBENTRY NOZZLE 
TUNDISH NOZZLE 
CHEMICAL PROPERTIES 





C (%) 
31.7 
22.4 
26.8 
25.4 
18.6 
15.8 
Al2O3(%) 
47.1 
58.7 
53.7 
47.2 
68.7 
SiO 2 (%) 
19.4 
8.8 
9.5 
22.3 
8.7 
8.6 
ZrO2(%) 
69.2 
PHYSICAL PROPERTIES 





A.P. (%) 
14.3 
12.4 
15.7 
16.2 
17.7 
17.2 
BD (gm/cc) 
2.27 
2.53 
2.4 
2.3 
3.27 
2.5 
MOR (Kg/cm²) 
102 
122 
125 
110 
95 
105 
TE (%) 
at 900°C 
0.25 
0.33 
0.3 
0.3 
0.4 
0.42 
Thermal Spalling Test  3 cycles  1 cycle  3 cycles 
0
1500°C/ Water  No crack  No crack  No crack 


Application Non preheat type
High corrosion resistance 
Preheat type  Non preheat type  Preheat type  Preheat type
High corrosion resistance 
Preheat type
High corrosion resistance 
 
GAS PURGING REFRACTORIES

POROUS PLUG 
SEATING BLOCK 
SLEEVE 
CHEMICAL PROPERTIES 


Al 2O3 (%) (Min) 
88 
75 
85 
Fe2 O3 (%) (Max) 
2.0 
0.5 
PHYSICAL PROPERTIES


A.P. (Vol. %) (Max) 
20 
21 
21 
B.D. (gm/cc) (Min)
2.8 
2.7 
2.8 
C.C.S. (Kg/cm) (Min)
900 
300 
300 
Flow rate (Ltrs/Min) 
at 2 Kg/cm (Min)
500 
Application  Directional porosity porous plug for longer purging in LF/VOD ladles  For fixing the porous plug in Ladle bottom  For protection of well block at the time of removal of plug 
 
CERAMIC FIBRE
CHEMICAL PROPERTIES
Al2O3 (%)
32 - 36 
SiO 2 (%)
44 - 48 
ZrO2(%)
16.5 - 19.5 
PHYSICAL PROPERTIES
Classificaiton Temp. (°C)
1425 
Colour
White  
Tensile Strength 128 Kg/m³ (K Pa)
30.6
Linear Shrinkage (%)
at 1200°C for 24 hrs. 
0
at 1400°C for 24 hrs.
<3.5 
Specific Heat Capacity (Kj/Kg°K) at 980°C
1.07 
Melting Point (°C)
> 1650 
Fibre Miameter (m) (Arithmetic Mean)
1.5 - 3.0 

 

 

     
 
 

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