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Insulation Bricks
Type
20 -Grade
23 - Grade
25 - Grade
26 - Grade
28 - Grade
Service Temperature
1230˚C
1250˚C
1350˚C
1430˚C
1510˚C
Bulk Density (gm/cc) max
Al
2
O
3
0.64
>38%
0.77
> 45%
0.615
50.50%
0.86
> 50%
0.96
>60%
Fe
2
O
3
<1%
<1%
0.88%
<1%
<1%
CCSMpa
1.20
1.8
2.25
2.2
2.20
Pyrometric Cone [ASTM] No.(min)
27
27
29
32
31
Thermal Conductivity
(kcal/m/hr/˚C max)
200˚C
0.12
0.16
-
-
-
400˚C
0.14
0.18
0.18
0.27
0.32
600˚C
0.16
0.20
0.19
0.30
0.34
800˚C
0.20
0.23
0.21
033
0.35
1000˚C
0.24
0.26
0.23
0.36
0.38
PLC at Service Temperature(˚C/3 hrs,max.)
0.5
0.5
0.5
0.5
0.5
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