项          目  Item    单位    N-1    N-2a    LZ-75    LZ-65    LZ-55
Al2O3                                        %    ≥42    ≥42    ≥75    ≥65    ≥55
Fe2O3                                        %                    
显气孔率  ,AP                              %                    
常温耐压强度,CCS                        Mpa    ≥30    ≥25    ≥53.9    ≥49    ≥44.1
0.2  Mpa荷重软化开始温度,RUL      ℃    ≥1400    ≥1350    ≥1520    ≥1500    ≥1470
重烧线变化率PLC    1500℃×2ｈ    %            0.1～-0.4    0.1～-0.4    0.1～-0.4
    1400℃×2ｈ        0.1～-0.4    0.1～-0.5            
耐火度
Refractoriness                                    ℃    ≥1750    ≥1730    ≥1790    ≥1790    ≥1770