Iron Oxide Yellow: 311,313, 490, 315, 586, 810 Fe2o3 â?¥86% Oil Absorptionï¼?25-35ml/100g Res. on 325 meshï¼?â?¤0.3 Water SOL. Salts: â?¤0.3 Moisture: â?¤1.0 PH: 3-7 Tamped apparent density(g/cm3): 0.4-0.6 Particle shape: acicular Compared with std.: â?¤1 Tinting strength: 95-105