Thermal Analysis (TA) and Fourier Transform Infrared Spectroscopy (FT-IR); were used in order to study the reaction of gamma-methacryloxypropyltrimethoxysilane (gamma-MPS) with slate surfaces at different temperature conditions (25, 35 and 50 degrees C), concentrations (0.5-5% weight of silane) and reaction times (1, 3, 5 and 10 min). By these conditions, a typical physical adsorption of the gamma-MPS silane on the slate surface has been observed. A monolayer of gamma-MPS is firstly adsorbed on the slate surface by hydrogen bonding through the carbonyl group of the silane and after that, silane multilayers are formed where free carbonyl groups are predominant. A concentration of 1% is considered as appropriate for silanization of the slate particles with gamma-MPS.