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Lightweight Insulating Fire Bricks
Lightweight Insulating Fire Bricks are made from high-purity refractory clay and alumina, with an appropriate amount of organic fillers added. These organic fillers are burned off during the production process, resulting in a uniform pore structure. For different temperature ratings, the amount of alumina added increases with the rating.
Lightweight insulating fire bricks are lightweight and have low heat storage capacity. They also have high and uniform porosity, providing excellent insulation. They are suitable for temperatures ranging from 900°C to 1550°C.
Conforming to ASTM standards, the AB series utilizes hollow alumina spheres and alumina powder with a composite binder, which is vibrated and fired at high temperatures. Lightweight insulating fire bricks offer excellent high-temperature performance and can be safely used at temperatures up to 1550°C.
Product Features
Low thermal conductivity and excellent insulation allow for thinner furnace walls.
Low heat capacity, lightweight, and low thermal conductivity allow for minimal heat storage within the bricks, significantly reducing energy consumption in intermittently operated furnaces.
Precise dimensions and high machining accuracy ensure consistent brick joints.
Physical and chemical properties
| Classification | YK23 | YK23 | YK26 | YK28 | YK30 | YK32 | AB96 | AB98 |
| Classification temperature (°C) | 1260 | 1260 | 1400 | 1500 | 1550 | 1600 | 1650 | 1700 |
| Density (kg/m³) | 550 | 800 | 800 | 900 | 1000 | 1100 | 1350 | 1500 |
| Reburning shrinkage (%) JIS R2613 (°C×8h) |
0.3 （1260） |
0.4 （1260） |
0.4 （1400） |
0.6 （1500） |
0.6 （1550） |
0.6 （1600） |
0.4 （1650） |
0.3 （1700） |
| Compressive strength (MPa) | 1.1 | 1.8 | 1.9 | 2.5 | 2.8 | 3 | 8.5 | 9.5 |
| Flexural strength (MPa) | 0.8 | 1.2 | 1.2 | 1.4 | 1.6 | 1.8 | - | - |
| Thermal conductivity 350°C (W/m·K) | 0.15 | 0.26 | 0.26 | 0.33 | 0.38 | 0.43 | - | - |
| Thermal expansion (%) (JIS R2617, °C) | ≤0.46 | ≤0.46 | ≤0.47 | ≤0.48 | ≤0.48 | ≤0.49 | - | - |
| Chemical compositionAl₂O₃ (%) | 40% | 40% | 54% | 62% | 74% | 80% | 96% | 98% |
| Chemical compositionFe₂O₃ (%) | 1.20% | 1.20% | 0.90% | 0.80% | 0.70% | 0.50% | 0.40% | 0.40% |
| Matching putty | RM-1400 | RM-1400 | RM-1400 | RM-1600 | RM-1600 | RM-1750 | RM-1750 | RM-1750 |
Chemical composition
| Classification | B4 | B5 | B6 | B7 | C1 | C2 |
| Classification temperature (°C) | 1200 | 1300 | 1400 | 1500 | 1300 | 1400 |
| Density (kg/m³) | 780 | 780 | 890 | 960 | 1060 | 1140 |
| Reburning shrinkage (%) JIS R2613 (°C×8h) |
0.3 (1200) |
0.3 (1300) |
0.6 (1400) |
0.9 (1500) |
0.7 (1300) |
0.8 (1400) |
| Compressive strength (ASTM C93, Mpa) | 1.4 | 1.5 | 2.4 | 3.5 | 3.6 | 4 |
| Flexural strength (ASTMC93, Mpa) | 0.8 | 0.8 | 1.5 | 2 | 2.1 | 2.6 |
| Thermal expansion (%) (JIS R2617, C) | 0.5 | 0.5 | 0.48 | 0.5 | 0.5 | 0.5 |
| Al₂O₃ (%) | 41% | 41% | 41% | 62% | 40% | 41% |
| Fe₂O₃ (%) | 1.20% | 1.20% | 1.40% | 0.90% | 1.20% | 1.20% |
| Matching putty | RM-1400 | RM-1400 | RM-1400 | RM-1400 | RM-1400 | RM-1400 |
Dimensions
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A 20-tonne Acheson graphitization furnace can hold full power for 24 to 40 hours and then need five to seven days of cooling before anyone opens it. Peak temperature is the headline number, but cost per tonne is decided by three quieter things: the furnace type, the condition of the insulation, and the shape of the power profile. Two shops running the same 2800 °C schedule can differ by 30 percent in kilowatt-hours per tonne. The gap is usually not the transformer. It is compressed graphite fel...
