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Material | Alumina | Dense Cordierite | Cordierite | Dense Alumina | Mullite | Corundum Mullite | ||
Density (G/Cm3) | 2.0~2.3 | 2.1 ~2.5 | 1.5 ~1.9 | 2.4 ~2.7 | 2.0 ~2.5 | 2.3 ~2.7 | ||
Coefficient Of Heat Expansion (×10-6K-1) (20~800℃) | ≤5 | ≤3.5 | ≤3.0 | ≤5 | ≤5 | ≤6 | ||
Specific Heat (J/Kg.K) (20~1000℃) | 900 ~1150 | 900 ~1100 | 900~1150 | 1000~1150 | 1000~1150 | 1100 ~1300 | ||
Thermal Conductivity (W/M.K) (20~1000℃) | 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 (℃/Min) | ≥300 | ≥350 | ≥350 | ≥300 | ≥350 | ≥300 | ||
Max. Working Tem. (℃) | 1350 | 1320 | 1320 | 1350 | 1450 | 1550 | ||
Water Absorption (%) | ≤20 | ≤1 | 15~25 | ≤2 | 15~25 | 15 ~25 | ||
Compressive Strength (Mpa) | A Axis | ≥32 | ≥32 | ≥29 | ≥34 | ≥28 | ≥39 | |
B Axis | ≥8 | ≥8 | ≥6 | ≥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 | 11 ~14 | 3~5 | 0 ~1 | 0 ~2 | ||
Others | <5 | <5 | <5 | <5 | <5 | <5 | ||








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