Description Iron Disilicide, 99% (Metals Basis), 25g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Appearance (Color) Dark gray Appearance (Form) Powder Purity (Metals Basis) 99% Purity (Complexometric, as Fe) 49.6% Particle Size -20 mesh X-Ray Diffraction Conforms to structure CAS: 12022-99-0 FORMULA: FeSi2