The choice of a reliable method for the testing of dispersant efficiency is an important issue in ceramics processing by emerging near net shape methods. The present paper presents the comparison of four methods for evaluation of the dispersibility properties of a commercial deflocculant Dolapix CE64, towards stabilization of submicron alumina powder suspended in water. The following techniques have been investigated for this purpose: zeta potential obtained from CVI measurement, specific surface charge based on streaming current, sedimentation and capillary suction time. A good correlation between the zeta potential and the streaming current as a means for determining the optimal dispersant dose and improved understanding of the dispersion mechanisms were obtained.