TREO≥99.0%

La₂O₃/TREO:25-28%

CeO₂/TREO:50-53%

Pr₆O₁₁/TREO:5-7%

Nd₂O₃/TREO:15-17%

Sm₂O₃ /TREO ≤ 0.05%

SiO₂≤ 0.02%

ZnO≤ 0.01%

灼减量≤1

Fe₂O₃ ≤ 0.03%

CaO ≤ 0.2%

MgO≤ 0.02%

Al₂O₃≤ 0.08%

Cl - ≤ 0.08%

SO₄2- ≤ 0.05%

PbO≤ 0.01%