Henan Hongtai Kiln Refractory Co.,Ltd.
PROFESSIONAL MANUFACTURE REFRACTORIES FOR FURNACE ！
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Name | Alumina | Dense Cordierite | Porous Cordierite | Dense Alumina | Mullite | Corundum mullite | ||
Density(g/cm3) | 2.0~2.3 | 2.1~2.5 | 1.7~2.0 | 2.4~2.7 | 2.0~2.5 | 2.3~2.7 | ||
Coefficient of heat expansion (×10-6K-1) (20~800ºC) | ≤5 | ≤3.5 | ≤3.0 | ≤5 | ≤5 | ≤6 | ||
Specific Heat (J/Kg.K) (20~1000ºC) | 900~1150 | 900~1100 | 900~1150 | 1000~1150 | 1000~1150 | 1100~1300 | ||
Thermal Conductivity (W/m.k) (20~1000ºC) | 1.5~2.0 | 1.5~2.5 | 1.2~1.8 | 1.5~2.5 | 1.5~2.0 | 1.5~2.5 | ||
Impact Thermal Resistance(ºC/min) | ≥450 | ≥500 | ≥500 | ≥450 | ≥500 | ≥450 | ||
Max. Working Tem.(ºC) | 1350 | 1320 | 1320 | 1350 | 1450 | 1550 | ||
Water absorption(%) | 15~25 | ≤1 | 15~25 | ≤1 | 15~25 | 15~25 | ||
Compressive strength(MPa) | A axis | ≥32 | ≥29 | ≥34 | ≥36 | ≥28 | ≥39 | |
B axis | ≥8 | ≥6 | ≥8 | ≥8 | ≥8 | ≥10 | ||
Chemical composition(%) | Al2O3 | 55~65 | 25~38 | 28~38 | 55~65 | 60~70 | 70~80 | |
SiO2 | 25~35 | 50~60 | 45~55 | 25~35 | 25~35 | 15~25 | ||
MgO | 1~3 | 5~10 | 12~14 | 3~5 | 0~1 | 0~2 | ||
others | <5 | <5 | <5 | <5 | <5 | <5 | ||