 |
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
|
|
|
