Description Iron Oxide Red, Powder -325 mesh, Analytical Grade, 99.7%, 100g For Research & Development Not for drug, human, animal, or food use Specifications: Appearance (Color) Red Appearance (Form) Powder Color (Compared with Standard) – Standard Tinting Strength 100% +/- 5% Assay (Fe2O3) 99+% Residue Retained on No. 325 Mesh Sieve <0.3% Volatile Matter at 105°C <1% Water-soluble Matter <0.5% pH-Value 3-7 Oil Absorption 15-25% CAS: 1309-37-1 FORMULA: Fe2O3