Chemical Formula: Fe3O4, Color Index: Pigment black 11 CAS No.: 1317-61-9 Basic types: 318,330,740,750 Iron Oxide Black CHEMICAL AND PHYSICAL ANALYSIS Fe as Fe2O3≥90.0% Test method ISO1248 Matter volatile at 105OC≤1.5% Test method ISO787-2 Water soluble matter≤0.5% Test method ISO787-3 pH value 5 ~8 Test method ISO787-9 Residue on 320mesh≤0.5% Test method ISO787-7 Oil absorption15~25g/100g Test method ISO787-5 Tinting Strength (Compared with Standard) 95~ 105% Test method ISO787-24