The study of rotational speed for complete suspension have been carried out by varying different parameters: density ratio, stirrer diameter, clearance of stirrer, solid particle diameter, and particle concentration. The equations of correlation available in the literature were tested in order to obtain the one giving the best prediction of experimental values. The proposed correlation enables the determination of the minimal rotational speed for complete suspension of microcapsules in a pilot reactor with a good accuracy. The results will be used for the scale up of a microencapsulation process from laboratory to the pilot stirred vessel, for which it is considered that the extrapolation factor is the minimal rotational speed for complete suspension.