email & msn : yuyuehong88@hotmail.com iron oxide black type: 722//8604//8603//8602 fe3o4: ≥95//≥90//≥95//≥93 oil absorption (%): 15-25 residue on bolted (%): ≤0.4 water soluble: ≤2.0 moisture (%): ≤1.0 ph-value: 5-7 density: 0.9-1.2 particle shape: spherical color difference vs standard: ≤1 tinting strength (%): 95-105 description: character: 1. black powder, strong tinting and covering 2. lightness alkali resistant, only dissolved in heat strong acid application: 1.industry coating,strong antirust 2. pigment of watercolour and grease-paint 3. tinting of the scagliola and concrete floor 4. material of the magnetic steel in telecommnication