| Item | JM23 | JM26 | JM28 | JM30 | JM32 | |
| Al2O3(%) | ≧37 | ≧54 | ≧64 | ≧72 | ≧77 | |
| Fe2O3(%) | ≦1.0 | ≦0.9 | ≦0.8 | ≦0.7 | ≦0.5 | |
| Classification Temperature(℃) | 1260 | 1400 | 1510 | 1620 | 1730 | |
| Bulk Density(g/cm³) | 0.55-1.0 | 0.8-1.0 | 0.85-1.0 | ≧1.0 | ≧1.25 | |
| Cold Crushing Strength (Mpa) | ≧1.2 | ≧1.6 | ≧2.1 | ≧2.5 | ≧3.5 | |
| Modulus of Rapture (Mpa) | ≧0.9 | ≧1.4 | ≧1.6 | ≧2.1 | ≧2.1 | |
| Thermal Expansion 1000℃ (%) | 0.5 | 0.7 | 0.8 | 0.9 | 1.1 | |
| Reheating Linear Change (%) CT-30 ℃X 8h | 1230℃-0.5 | 1400℃-0.5 | 1510℃-0.5 | 1620℃-0.9 | 1730℃-0.9 | |
| Thermal Conductivity （W/m.k） | 400℃ | 0.14 | 0.27 | 0.32 | 0.41 | 0.49 |
| 600℃ | 0.16 | 0.29 | 0.34 | 0.43 | 0.50 | |
| 800℃ | 0.18 | 0.31 | 0.36 | 0.44 | 0.51 | |
| 1000℃ | 0.20 | 0.33 | 0.38 | 0.45 | 0.53 | |
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