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SiO2 | Al2O3 | SiO2+Al2O3 | Fe2O3 | CaO | MgO | K2O+Na2O | Other |
>69% | 15-23% | >92% | <1% | <0.25% | <0.2% | 2-4% | <1% |
Index | Value |
Porosity(Vol%) | 1 |
Specific heat(KJ/Kg) | 840-900 |
Crush strength(N/mm2) | 390-420 |
Specific gravity(g/cm3) | 2.3-2.45 |
Acid resistance(%) | 99.98 |
Firing temperature(℃) | 1280 – 1320 |
Softening temperature(℃) | >1400 |
Density(Kg/m3) | 2300 – 2400 |
Water absorption(%) | <0.2 |
Thermal expansion(10-6mm/mm℃) | 4.7 |
Moh’s hardness(Scale) | 7 – 8 |
Comprehensive strength(Newtons) | 5600 |
Shock strength(Kgf.cm/cm2) | 1.0 – 1.5 |


















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