| Item | ZGN-42 | GN-42 |
| Al2O3，% | ≥42 | ≥42 |
| Fe2O3，% | ≤1.6 | ≤1.7 |
| Refractoriness, ℃ | ≥1750 | ≥1750 |
| Appearance porosity,% | ≤15 | ≤16 |
| Cold crushing strength，MPa | ≥58.8 | ≥49.0 |
| Refractoriness under load,0.2Mpa，℃ | ≥1450 | ≥1430 |
| Linearing changes on reheating(1450℃×3h)，% | 0～-0.2 | 0～-0.3 |