Mass fraction of silver (Ag), %, not less than 99.90

Mass fraction of impurities, %, not more than: — copper(Cu) 0.005 — iron, zinc, lead, bismuth, antimony, aluminum (in total) 0.01 — sulfates (SO4) 0.004 — nitrates (NO3) 0.001;

Mass fraction of moisture, %, not more than 0.03;

Mass fraction of substances insoluble in nitric acid, %, not more than 0.05