Description Lead Metal, Button, 40mm Dia x 8mm Thick, 99.9998% (Metals Basis), 115g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Appearance (Color) Gray Appearance (Form) Button Purity (Metals Basis) 99.9998% ICP Analysis Confirms Pb component Total Metallic Impurities (ppm) Silver (Ag) 0.005 Arsenic (As) 0.05 Thallium (Tl) 0.1 Indium (In) 0.01 Copper (Cu) 0.001 Antimony (Sb) 0.05 Mercury (Hg) 0.1 Sodium (Na) 0.2 Zinc (Zn) 0.05 Magnesium (Mg) 0.05 Aluminum (Al) 0.05 Calcium (Ca) 0.2 Bismuth (Bi) 0.01 Iron (Fe) 0.05 Cadmium (Cd) 0.001 CAS: 7439-92-1 FORMULA: Pb