Single and mixed particle suspensions of kaolin, bentonite, starch and PMMA were carried out using a dead-end Amicon filtration cell with microfiltration membranes. The experimental data of permeate fluxed were fitted by the constant pressure filtration models in order to investigate fouling steps. The cake filtration model was the most suitable. However, in the cases of starch particles, standard pore blocking occurred during the initial filtration, and then cake filtration was followed.