Grade                            

99.9999%

99.999%

99.99%

99.9%

Tm2O3/TREO (% min.)

99.9999

99.999

99.99

99.9

TREO (% min.)

99.9

Loss On Ignition (% max.)

0.5

0.5

Rare Earth Impurities

% max.

% max.

% max.

% max.

Tb4O7 /TREO

Dy2O3 /TREO

Ho2O3/TREO

Er2O3/TREO

Yb2O3/TREO

Lu2O3 /TREO

Y2O3/TREO

0.00001
0.00001
0.00001
0.00005
0.00005
0.00005
0.00001

0.0001
0.0001
0.0001
0.0005
0.0005
0.0001
0.0001

0.0005
0.0005
0.0005
0.0025
0.0025
0.0005
0.0005

0.001
0.001
0.001
0.01
0.01
0.001
0.001

Non-Rare Earth Impurities

% max.

% max.

% max.

% max.

Fe2O3

SiO2

CaO

CuO

Cl-

NiO

ZnO

PbO

0.0001
0.0005
0.0005
0.0001
0.005
0.0001
0.0001
0.0001

0.0003
0.001
0.001
0.0001
0.01
0.0002
0.0003
0.0002

0.0005
0.005
0.003
0.0005
0.03
0.0005
0.001
0.0005 

0.001
0.01
0.01
0.001
0.03
0.001
0.001
0.001