Assay (acidimetric): ≥ 99.9 %

Identity: passes test

Appearance of solution (5 %; ethanol 96 %): passes test

Appearance of solution (color): passes test

Appearance of solution (clearness): passes test

Sulfate (SO₄): ≤ 0.002 %

Heavy metals (as Pb): ≤ 0.0005 %

Fe (Iron): ≤ 0.005 %

halogenated compounds (as Cl): ≤ 0.005 %

Sulfur compounds (as S): ≤ 0.002 %

In methanol insoluble matter: ≤ 0.005 %

Oxidizable matter: passes test

Substances reducing permanganate: passes test

Readily carbonisable substance: passes test

Sulfated ash: ≤ 0.005 %

Water: ≤ 0.5 %

Corresponds to Reag. Ph Eur