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Purity (metallic) ≥ 99.999 %

Assay (acidimetric) ≥ 99.5 %

Chloride (Cl) ≤ 10 ppm

Phosphate (PO₄) ≤ 0.05 ppm

Silicate (SiO₂) ≤ 5 ppm

Sulfate (SO₄) ≤ 10 ppm

Al (Aluminium) ≤ 0.05 ppm

As (Arsenic) ≤ 0.1 ppm

Ba (Barium) ≤ 5.0 ppm

Ca (Calcium) ≤ 0.10 ppm

Cd (Cadmium) ≤ 0.005 ppm

Ce (Cerium) ≤ 0.010 ppm

Co (Cobalt) ≤ 0.005 ppm

Cr (Chromium) ≤ 0.010 ppm

Cu (Copper) ≤ 0.005 ppm

Eu (Europium) ≤ 0.010 ppm

Fe (Iron) ≤ 0.05 ppm

Hg (Mercury) ≤ 0.05 ppm

K (Potassium) ≤ 1.0 ppm

La (Lanthanum) ≤ 0.010 ppm

Li (Lithium) ≤ 0.5 ppm

Mg (Magnesium) ≤ 0.10 ppm

Mn (Manganese) ≤ 0.010 ppm

Ni (Nickel) ≤ 0.020 ppm

Pb (Lead) ≤ 0.010 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) ≤ 0.010 ppm