INSULATING FIRE BRICK
High-performance, heat-resistant bricks engineered for industrial furnaces, kilns, boilers, and thermal processing equipment. Available in fireclay, high-alumina, insulating, and specialty grades, our refractory bricks deliver exceptional strength, thermal stability, and long service life. With extensive inventory and custom shape capabilities, we support fast turnarounds, repairs, and large-scale OEM projects.
We maintain over 90 pallets of insulating fire brick in stock. 2300°F, 2600°F, and 2800°F grades are readily available for rapid shipment. Custom shapes of all kinds are also available, with lead times varying based on the complexity of the design.
Insulating Fire Brick GJM23
Specification
Description
GJM23
Classification Temperature (℉）
2300
Bulk Density (lb/ft³)
37
Cold Crushing Strength (lb/in²)
170
Modules of Rupture (lb/in²)
145
Permanent Liner Change (%)
-0.2 2246℉x24h
Reversible Linear Thermal Expansion
% (max)
0.6
Thermal Conductivity (W/m.K)
752℉
0.20
1112℉
0.22
1472℉
0.28
1832℉
0.32
2192℉
-
Chemical Analysis
Al₂O₃ (%)
45
Fe₂O₃ (%)
1.0
SiO₂ (%)
50
CaO (%)
-
K₂O+Na₂O (%)
1.6
Insulating Fire Brick GJM26
Specification
Description
GJM26
Classification Temperature (℉）
2600
Bulk Density (lb/ft³)
50
Cold Crushing Strength (lb/in²)
313
Modules of Rupture (lb/in²)
218
Permanent Liner Change (%)
-0.5 2552℉x24h
Reversible Linear Thermal Expansion
% (max)
0.7
Thermal Conductivity (W/m.K)
752℉
0.29
1112℉
0.32
1472℉
0.35
1832℉
0.38
2192℉
0.41
Chemical Analysis
Al₂O₃ (%)
55
Fe₂O₃ (%)
0.9
SiO₂ (%)
40
CaO (%)
-
K₂O+Na₂O (%)
1.6
Insulating Fire Brick GJM28
Specification
Description
GJM28
Classification Temperature (℉）
2800
Bulk Density (lb/ft³)
56
Cold Crushing Strength (lb/in²)
370
Modules of Rupture (lb/in²)
232
Permanent Liner Change (%)
-0.6 2750℉x24h
Reversible Linear Thermal Expansion
% (max)
0.6
Thermal Conductivity (W/m.K)
752℉
0.34
1112℉
0.36
1472℉
0.39
1832℉
0.41
2192℉
0.43
Chemical Analysis
Al₂O₃ (%)
65
Fe₂O₃ (%)
0.7
SiO₂ (%)
32
CaO (%)
-
K₂O+Na₂O (%)
1.0
Insulating Fire Brick GJM30
Specification
Description
GJM30
Classification Temperature (℉）
3000
Bulk Density (lb/ft³)
64
Cold Crushing Strength (lb/in²)
398
Modules of Rupture (lb/in²)
247
Permanent Liner Change (%)
-0.8 2948℉x24h
Reversible Linear Thermal Expansion
% (max)
0.9
Thermal Conductivity (W/m.K)
752℉
0.40
1112℉
0.42
1472℉
0.44
1832℉
0.45
2192℉
0.47
Chemical Analysis
Al₂O₃ (%)
72
Fe₂O₃ (%)
0.6
SiO₂ (%)
25
CaO (%)
-
K₂O+Na₂O (%)
0.6
