TREO≥ 45%

La₂O₃/TREO:25-28%

CeO₂/TREO:50-53%

Pr₆O₁₁/TREO:5-7%

Nd₂O₃/TREO:15-17%

Sm₂O₃/TREO≤0.05%

ZnO≤0.005%

PbO≤0.005%

Fe₂O₃≤0.01%

CaO≤0.1%

MgO≤0.01%

SiO₂≤0.01%

Al₂O₃≤0.04%

Cl-≤0.04%

SO₄^2-≤0.02%