SPECIFICATION OF IRON OXIDE RED/YELLOW/BLACK Product Type Fe2O3 %≥ Oil absorption ml/100g Res. On 325 mesh %≤ Water sol. Salt %≤ Moisture %≤ PH Value Tamped Apparent Density g/m3 Particle Shape ΔE compared with std. ≤ Tinting strength % Iron Oxide Red 130 97 15~25 0.3 0.3 1.0 3~7 0.7~1.1 Spherical 1 95~105 Iron Oxide Yellow 313 86 25~35 0.3 0.3 1.0 3~7 0.3~0.5 Acicular 1 95~105 Iron Oxide Black 740 93 15~25 0.4 0.5 1.0 5~8 0.8~1.2 Spherical 1 95~105