项目   1                                                   高纯4N级

纯度/purity：                                            ≥99.99%

密度density                                               7.81 g/mL（25℃）

下面5种稀土总杂质RE impurities，ppm： ≤100ppm

Gd2O3、Tb2O3、Ho2O3、Er2O3、Y2O3

稀土总量    TREO                               ≥99%

非稀土杂质Non-impurities，ppm：

Fe2O3                                                ≤7ppm

SiO2                                                   ≤30ppm

CaO                                                    ≤20ppm

Cl-                                                      ≤100ppm

灼烧减量 Loss on ignition                   ≤1%

项目   2

REO min %                         99.0                 99.0

Dy2O3 /REO min %           99.90               99.5

稀土杂质 /REO  max %   

Gd2O3                               0.0100             0.0500

TbO2                                  0.0400             0.2000

Ho2O3                                0.0300             0.1000

Er2O3                                 0.0100             0.0500

Y2O3                                  0.0100             0.0500

非稀土杂/Non-RE impurities max %

Fe2O3                                0.0015             0.0050

CaO                                    0.0030             0.0100

CuO                                    0.00

SiO2                                   0.0050             0.0050

CI-                                      0.0300              0.0500

灼减(000 ℃,1h)max %      1.0                   1.0