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LBK Insulating Firebricks
| Features |
World’s lightest, low thermal conductivity, low heat storage |
| Kinds |
LBK-20, LBK-23, LBK-26, LBK-28, LBK-30, and LBK 3000 |
| Applications |
For the hot surface and back-up lining of following industrial furnaces.
1. Annealing furnaces
2. Galvanizing furnaces
3. Heat-treating furnaces
4. Air-heating furnaces
5. Naphtha cracking furnaces
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Standard
| Item |
LBK-20 |
LBK-23 |
LBK-26 |
| Temperature |
1200 |
1300 |
1400 |
| Bulk Density |
0.50≧ |
0.55≧ |
0.75≧ |
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Thermal Conductivity at 350±10℃
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0.17≧ |
0.19≧ |
0.24≧ |
| Cold Crushing Strength (MPa) |
0.59≧ |
0.78≧ |
0.98≧ |
| Modulus of Rupture |
0.49≧ |
0.69≧ |
0.78≧ |
| Content rate of Fe2O3 (%) |
1.5≧ |
1.5≧ |
1.5≧ |
| Item |
LBK-28 |
LBK-30 |
LBK-3000 |
| Temperature |
1500 |
1550 |
1600 |
| Bulk Density |
0.80≧ |
0.90≧ |
0.90≧ |
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Thermal Conductivity at 350±10℃
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0.27≧ |
0.30≧ |
0.37≧ |
| Cold Crushing Strength (MPa) |
0.98≧ |
1.5≦ |
1.5≦ |
| Modulus of Rupture |
0.98≧ |
1.5≦ |
1.3≦ |
| Content rate of Fe2O3 (%) |
1.0≧ |
1.0≧ |
1.0≧ |
Note: Above standard is subject to change without notice.
Test Results on Samples
| Item |
LBK-20 |
LBK-23 |
LBK-26 |
| Reheat Shrinkage |
0.03 (1200) |
0.19 (1300) |
0.25 (1400) |
| Bulk Density |
0.48 |
0.52 |
0.59 |
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Thermal Conductivity at 350±10℃
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0.16 |
0.17 |
0.23 |
| Cold Crushing Strength (MPa) |
1.4 |
2.0 |
2.9 |
| Modulus of Rupture |
1.0 |
1.2 |
1.4 |
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Chemical Composition
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Al2O3 |
45 |
45 |
55 |
| SiO2 |
49 |
49 |
42 |
| Fe2O3 |
1.4 |
1.4 |
0.7 |
| Item |
LBK-28 |
LBK-30 |
LBK-3000 |
| Reheat Shrinkage |
0.31 |
0.28 (1550) |
0.26 (1600) |
| Bulk Density |
0.70 |
0.75 |
0.78 |
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Thermal Conductivity at 350±10℃
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0.25 |
0.28 |
0.32 |
| Cold Crushing Strength (MPa) |
3.2 |
3.5 |
3.2 |
| Modulus of Rupture |
1.7 |
1.9 |
1.7 |
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Chemical Composition
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Al2O3 |
72 |
69 |
76 |
| SiO2 |
26 |
30 |
24 |
| Fe2O3 |
0.6 |
0.5 |
0.3 |
Note: Above test results are average results of tests conducted under standard procedures and subject to variation. Results should not be used for specification purposes.
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