Purity (metallic): ≥ 99.995 %

Al (Aluminium): ≤ 0.050 ppm

Ba (Barium): ≤ 5.0 ppm

Ca (Calcium): ≤ 0.50 ppm

Cd (Cadmium): ≤ 0.010 ppm

Co (Cobalt): ≤ 0.010 ppm

Cu (Copper): ≤ 0.010 ppm

Fe (Iron): ≤ 0.10 ppm

K (Potassium): ≤ 5.00 ppm

Li (Lithium): ≤ 0.10 ppm

Mg (Magnesium): ≤ 0.050 ppm

Mn (Manganese): ≤ 0.010 ppm

Na (Sodium): ≤ 1.0 ppm

Ni (Nickel): ≤ 0.010 ppm

Pb (Lead): ≤ 0.010 ppm

Sr (Strontium): ≤ 0.50 ppm

Tl (Thallium): ≤ 0.010 ppm

Zn (Zinc): ≤ 0.010 ppm