| 特殊要求: 
 
        
          
            | 牌号 | 化学成份       % | 放射性不大于Bq/g | 其它杂质不大于% |  
            | TREM | Ce/TREM | Pr/TREM | Nd/TREM | La/TREM | Fe | Si | W | Mo | Mg | Ti | Al | C | Zn | Mn | Pb |  
            | 1 
 | >99 | >50-56 | >5-7 | >13-19 | >23-29 | <0.5 | <0.03 | <0.03 | <0.03 | <0.1 | <0.01 | - | <0.05 | <0.07 | - | - | - | - |  
            | 2 | ≥99 | 50-58 | 3.5-7 | 13-20 | 21-29 | ≤0.5 | ≤0.2 | ≤0.1 | - | ≤0.1 | - | - | - | ≤0.07 | - | - | - | - |  
            | 3 | >99 | 53±3 | 3.5-7 | 16±3 | 26±3 | <0.5 | <0.03 | <0.03 | <0.03 | <0.1 | - | - | - | <0.07 | - | - | - | - |  
            | 4 | >98.5 | >48-56 | >4-7 | >12-20 | <20-27 | <0.2 | <0.2 | - | <0.2 | <0.1 | - | <0.5 | <0.05 | <0.2 | <0.5 | <0.01 | 1 | 0.05 |   
     |