IUPAC name Iron Oxide Molecular formula Fe2O3 Fe3O4 CAS number Fe2O3 1309-37-1 Fe3O4 12227-89-3 appearance red/brown/black/yellow/blue powder Item BitmapIron Oxide Red 130 Iron oxide Red 190 Bitmap Iron oxide Brown 610 Bitmap Iron Oxide Black 780 Bitmap Iron oxide Yellow 313 BitmapIron Oxide Blue Fe2O3/Fe3O4≥% 96 95 92 93 86 105°C Moisture ≤% 1 1 1 1 1 1 Water soluble salts ≤% 0.3 0.3 0.5 0.5 0.3 0.5 Residue on 45um≤% 0.2 0.2 0.3 0.3 0.3 0.3 PH-value 3.5-8 3.5-8 4-7 5-8 3.5-7 Oil absorption 15-25 15-25 20-30 12-25 25-35 Tinting strength % 95-105 95-105 95-105 95-105 95-105 95-105 Density approx / cm 3 5.0-5.1 5.0-5.1 4.8 4.5-5.0 4.0-4.3 Packing: Packing: 25 kg/bag, 23MT/20FCL (Iron Oxide Red), 14 MT/ 20FCL (Iron Oxide Yellow), 20MT/ 20FCL (Iron Oxide Brown, Black, Green).Usage: Iron Oxide is a kind of pigment chemcials and can be used in various industries like cosmetic industry, paint industry, other others.