| Item | RL-65 | RL-55 | RL-48 | |
| Al2O3 % | ≥65 | ≥55 | ≥48 | |
| Refractoriness,℃ | ≥1780 | ≥1760 | ≥1740 | |
| 显气孔率 % | ≤22（24） | |||
| 常温耐压强度CCS,MPa | ≥50 | ≥45 | ≥40 | |
| RUL,0.2MPa，℃ | ≥1500 | ≥1470 | ≥1420 | |
| Linear changes on reheating（%） | 1500℃×2h | +0.1～-0.4 | +0.1～-0.4 | / |
| 1450℃×2h | / | +0.1～-0.4 | ||
| Thermal shock resistance (1100℃,water cooling）,Cycle |
（roof、wall）≥6 | |||
| Note：the value in brackets is for checker of regenerator. | ||||