冶金行业用耐火材料 
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| 项目 | 通用高铝砖 | 高炉高铝砖 | 热风炉高铝砖 | ||||
| 牌号TYpe | LZ-75 | LZ-65 | LZ-55 | GZ-65 | GZ-55 | RL-65 | RL-55 |
| A|2O3≤% | 75 | 65 | 55 | 65 | 55 | 65 | 55 |
| Fe2o3%≤ | 20 | ||||||
| 耐火度℃≥Refractoriness | 1790 | 1790 | 1770 | 1790 | 1770 | 1780 | 1760 |
| 0.2MP荷重软化开始温度℃Start temperature of refractorinedd≥under 0.2mpa load℃ | 1520 | 1500 | 1450 | 1500 | 1480 | 1500 | 1470 |
| 重烧1500℃2h%linea variation when repca-tedly burned%1500℃ 2h | +0.1 | --0.4 | 0 | --0.2 | +0.1 | --0.4 | |
| 显气孔率%appaernt porositu %≤ | 23 | 23 | 22 | 19 | 19 | 24 | 24 |
| 常温耐压强度 mpacompressive strength undernormal temperature mpa ≥ | 50 | 45 | 40 | 58 | 49 | 49.0 | 44.1 |