Purity (metallic): ≥ 99.99 %

Assay (perchloric acid titration): ≥ 99 %

Chloride (Cl): ≤ 5 ppm

Phosphate (PO₄): ≤ 5 ppm

Sulfate (SO₄): ≤ 20 ppm

Al (Aluminium): ≤ 0.05 ppm

Ba (Barium): ≤ 5.0 ppm

Bi (Bismuth): ≤ 0.01 ppm

Ca (Calcium): ≤ 0.10 ppm

Cd (Cadmium): ≤ 0.005 ppm

Ce (Cerium): ≤ 0.005 ppm

Co (Cobalt): ≤ 0.005 ppm

Cr (Chromium): ≤ 0.010 ppm

Cs (Cesium): ≤ 2.0 ppm

Cu (Copper): ≤ 0.005 ppm

Fe (Iron): ≤ 0.05 ppm

K (Potassium): ≤ 5 ppm

La (Lanthanum): ≤ 0.005 ppm

Mg (Magnesium): ≤ 0.10 ppm

Mn (Manganese): ≤ 0.050 ppm

Ni (Nickel): ≤ 0.010 ppm

Pb (Lead): ≤ 0.005 ppm

Rb (Rubidium): ≤ 0.5 ppm

Sc (Scandium): ≤ 0.005 ppm

Sm (Samarium): ≤ 0.005 ppm

Sr (Strontium): ≤ 0.10 ppm

Tl (Thallium): ≤ 0.005 ppm

Y (Yttrium): ≤ 0.005 ppm

Zn (Zinc): ≤ 0.010 ppm