| Item | RN－42 | HRN－42 | HRN－48 |
| Al2O3 % | ≥42 | ≥42 | ≥48 |
| Fe2O3 % | ≤1.7 | ≤1.7 | ≤1.7 |
| Refractoriness, ℃ | ≥1750 | ≥1750 | ≥1750 |
| BD, g/cm3 | ≥2.15 | ≥2.15 | ≥2.35 |
| AP, % | ≤24/23 | ≤24/21 | ≤24/21 |
| CSS, MPa | ≥30 | ≥40 | ≥40 |
| RUL,0.2MPa，℃ | ≥1400 | ≥1520 | ≥1550 |
| PLC（%） | 0～-0.3 | 0～-0.3 | 0～-0.3 |
| Thearal shock resistance， (1100℃,water cooling)Cycle |
≥20 | ≥30 | ≥40 |
| Note：the value in brackets is for checker of regenerative chamber. | |||