In the present work; we carried out a study about the erosion of the soda lime glass coated with a layer of the acrylic varnish. The results show that a maximum of the rate of erosion is recorded for the angle 25 °. Which is typical in ductile materials. The comparison between the theoretical curves and the experimental curves, showed a dispersion due to the large number of parameters which included during the phenomenon of erosion.

In the literature, and in spite of the complexity of the phenomenon of erosion, works ended in analytical models. The models of erosion are designed, first of all, by means of the calculation of the volume of material extracted during the impact of a single particle. The removed total volume is calculated by adding the volumes removed by all the particles. The obtained expression is generally a relation between the extracted volume and the various parameters of flow and the particles which are involved in the process. One or several empirical parameters stemming from experiments are generally introduced to correct the value calculated by the affected volume [1 ].

In this work, we used a theoretical model [2], to predict the rate of erosion of glasses taken on during the sanding.

We notice that the maximal damage is observed in 25 ° for both curves. But he ya a difference in the value of the maximum of the rate of recorded erosion.

It is obvious that mass loss increases according to the mass of the thrown particles, the dispersal between the theoretical and experimental curves can be due to parameters involvements during sanding (form and size of particles, speed of impact ...).

During the process of erosion, the speed of the erosive particles plays an important role.