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| Item | MZ-91 | MZ-92 | MZ-93 | MZ-94 | |
| Chemical composition % | MgO ≥ | 91 | 92 | 93 | 94.5 |
| SiO2 ≤ | 4.0 | 3.5 | 2.5 | 2.0 | |
| Fe2O3 ≤ | 1.3 | - | - | 1.2 | |
| CaO ≤ | 2.5 | 2.5 | 2.0 | 1.8 | |
| Apparent Porosity％ ≤ | 18 | 18 | 18 | 18 | |
| Bulk Density g/cm3 ≥ | 2.86 | 2.90 | 2.95 | 2.92 | |
| Cold Crushing Strength Mpa ≥ | 60 | 60 | 50 | 60 | |
| 0.2Mpa Refractoriness Under Load T0.6 ℃ | ≥1570 | ≥1560 | ≥1620 | ≥1650 | |
| Permanent Linear Change On Reheating（%）1500℃X2h | 0～+0.4 | 0～+0.4 | 0～+0.4 | 0～+0.4 | |
| Thermal Shock Resistances 100℃ water cycles | ≥18 | ≥18 | ≥18 | ≥18 | |