Insulating Fire Bricks

Insulating Fire 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
Al2O3 
0.64
38%
0.77
45% 
0.615
50.50% 
0.86
50% 
0.96
60% 
Fe2O3  1%  1%  0.88%  1%  1% 
CCSMpa  1.20  1.8  2.25  2.2  2.20 
Pyrometric Cone [ASTM] No.(min)CCSMpa  27  27 29 32 31
Thermal Conductivity
(kcal/m/hr/˚C max) 
200˚  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  0.33  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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