Abstract: In present work the viscosity of suspensions of γ-Fe₂O₃ particles in polymer solutions have been measured as a function of concentration at shear rates Dfrom 21.2 sec^-1 to 571 sec^-1. The intrinsic viscosity,[η] ,derived from the concentration dependence of the viscosity by using Mooney equation, was found to decrease with increasing shear rate. The floc size, estimated from the [η] and a theoretical treatment of floc growth by vold, was consistent with the result obtained from sedimentation ratcs. The effects of various polymer adhesives and surfactants on the dispersity of suspensions were determined. It was found that, the intrinsic viscosities of γ-Fe₂O₃ suspensions containing different polymer adhesives showed a great divergence at low shcar rate, but reached an about the same value at infinite shear rale. The addition of surfactants decreased the [η]_∞, but increased slightly the [η] at low shear rate. Astructural model of the floc was proposed to interpret the experimental results.