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Top Page > English > Products > Insulating Firebricks > LBK Lightweight Insulating Firebricks

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LBK Insulating Firebricks

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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

Standard

Item LBK-20 LBK-23 LBK-26
Temperature 1200 1300 1400
Bulk Density 0.50≧ 0.55≧ 0.75≧

Thermal Conductivity at 350±10℃

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≧

Thermal Conductivity at 350±10℃

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

Thermal Conductivity at 350±10℃

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

Chemical Composition

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

Thermal Conductivity at 350±10℃

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

Chemical Composition

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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