This paper deals with concentrated suspensions (pastes) of TiO2 particles at a solid concentration of 60% per weight in an acidic binder. This paste is used to manufacture petrochemical catalysts. First we show that in a squeezing experiment binder migration occurs in the suspension as long as the velocity at which the test is carried out does nor exceed a critical value. Next, we develop a mathematical model of the test and a complete methodology to identify the theological parameters of this model. We give an analytical expression of the critical velocity, which is related to the physical characteristics of the suspension. The exact identification of the theological parameters requires the use Of a numerical program which was developed for this application.