TREM （ %）                              ≥ 99.5     ≥ 98
Yb/RE （ %）                             ≥ 99.99    ≥ 99.9
稀土杂质含量（Lu+Er+Tm+Y）RE  (%/TREM)   ≤ 0.01     ≤ 0.10
非稀土杂质含量Non-RE  (%/TREM)
Mg                                      ≤ 0.005    ≤ 0.005
Al                                      ≤ 0.01     ≤ 0.01
Si                                      ≤ 0.005    ≤ 0.005
Ca                                      ≤ 0.01     ≤ 0.01
Fe                                      ≤ 0.005    ≤ 0.005
Mo                                      ≤ 0.01     ≤ 0.01
Cl                                      ≤ 0.02     ≤ 0.03
O                                       ≤ 0.05     ≤ 0.10
W                                       ≤ 0.01     ≤ 0.01
粒度：-40-300目