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Technical Analysis Table Classification Ultra High Temperature | UTR | UTR-99 | UTR-91 | Chemical Composition (%) | AL2O3 | 99.0 | 91.0 | SiO©ü | 0.7 | 8.7 | Fe2O3 | 0.3 | 0.3 | Refractoriness(¡ÆC) | 1910 | 1880 | Refractoriness under load, 0.5MPa, (¡ÆC) | 1800 | 1720 | Apparent porosity (%) | 14 | 18 | Bulk density (g/cm©ø) | 3.2 | 3.0 | Cold crushing strength (MPa) | 87 | 87 | Thermal expansion at 1400¡ÆC (%) | 0.1 | 0.2 | The recommended temperature (¡ÆC) | 1800 | 1700 |
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