Description Boron Oxide, 99.999% (Metals Basis), 5g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Appearance (Form) Powder Appearance (Color) White Assay (Metals Basis) 99.999% Assay (Titration; as B) 30.5-31.5% CAS: 1303-86-2 FORMULA: B2O3