Purity (metallic): ≥ 99.999 %

Assay (alkalimetric): ≥ 99.0

Chloride (Cl): ≤ 5 ppm

Total nitrogen (N): ≤ 5.0 ppm

Al (Aluminium): ≤ 0.050 ppm

Ba (Barium): ≤ 1.0 ppm

Bi (Bismuth): ≤ 0.01 ppm

Ca (Calcium): ≤ 0.10 ppm

Cd (Cadmium): ≤ 0.005 ppm

Ce (Cerium): ≤ 0.020 ppm

Co (Cobalt): ≤ 0.005 ppm

Cr (Chromium): ≤ 0.010 ppm

Cu (Copper): ≤ 0.020 ppm

Eu (Europium): ≤ 0.010 ppm

Fe (Iron): ≤ 0.050 ppm

Hg (Mercury): ≤ 0.05 ppm

La (Lanthanum): ≤ 0.010 ppm

Li (Lithium): ≤ 0.2 ppm

Mg (Magnesium): ≤ 0.10 ppm

Mn (Manganese): ≤ 0.020 ppm

Na (Sodium): ≤ 5.0 ppm

Ni (Nickel): ≤ 0.020 ppm

Pb (Lead): ≤ 0.050 ppm

Sc (Scandium): ≤ 0.010 ppm

Sm (Samarium): ≤ 0.010 ppm

Sr (Strontium): ≤ 0.10 ppm

Tl (Thallium): ≤ 0.01 ppm

Y (Yttrium): ≤ 0.010 ppm

Yb (Ytterbium): ≤ 0.010 ppm

Zn (Zinc): ≤ 0.050 ppm