Certifie of Analysis. Certifie of Analysis Carbonyl iron 982% by Fe basis, Biotechnology Grade Product # BIO Lot # STBB1798, Density 786 g/mL at 25°C (lit) Elemental analysis (Carbon) 078% Elemental analysis (Nitrogen) 066 % Grey powder Melting point 1535°C (lit) Particle size . 10 micron Resistivity 971 μΩcm Quantity.