Insulating Fire Bricks
Grade 23–30 Lightweight Refractory Insulation Bricks
Lightweight insulating fire bricks for hot-face and back-up insulation in industrial furnaces, glass equipment, aluminium furnaces, petrochemical heaters and thermal-processing lines.
PRODUCT RANGE
• Grade 23, Grade 26, Grade 28 and Grade 30 insulating fire bricks
• Standard straight bricks, wedges, arches and custom machined shapes
• Hot-face and back-up insulation grades
• Low-iron and high-purity grades for controlled atmospheres
KEY BENEFITS
Low thermal conductivity and heat storage; accurate dimensions; easy cutting and machining; good thermal shock resistance; controlled density and compressive strength.
TYPICAL TECHNICAL DATA
Property | Grade 23 | Grade 26 | Grade 28 | Grade 30
Classification temperature (°C) | 1300 | 1400 | 1500 | 1550
Al₂O₃ (%) | 40 | 56 | 67 | 73
SiO₂ (%) | 51 | 41 | 30 | 24
Fe₂O₃ (%) | ≤1.0 | ≤0.8 | ≤0.7 | ≤0.6
Bulk density (kg/m³) | 600 | 800 | 900 | 1000
Modulus of rupture (MPa) | ≥0.9 | ≥1.5 | ≥1.8 | ≥2.0
Cold crushing strength (MPa) | ≥1.2 | ≥2.4 | ≥2.6 | ≥3.0
Thermal conductivity at 600°C (W/m·K) | 0.23 | 0.27 | 0.38 | 0.40
APPLICATIONS
Reheating and heat-treatment furnaces, aluminium melting and holding furnaces, glass furnace superstructures and regenerators, petrochemical heaters, cracking and reforming furnaces, kiln cars, furnace doors and general high-temperature insulation.
Values shown are typical reference values. Final grade, size tolerance and guaranteed specification must be confirmed against the service temperature, atmosphere, mechanical load and lining design.
