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The curing mechanism of a silicon resin, pure or mixed with catalyst is discussed here. The silicon resin is a polymethylsilsesquioxane containing hydroxyl and ethoxy side groups which ensure the condensation. Side-products of this condensation are water and ethanol. The solid curing catalyst used is the aluminium acetylacetonate. Former studies have been developed on liquid solutions of silicon resins and catalysts in solvent, ensuring the complete contact between species -with maximum efficiency-, this work proposes a solid state mixing and questions the real utility of the catalyst. This work is divided in three parts: the first one is about resin behavior and reactions occurring under non-isothermal conditions, using different methods as Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). The second step deals with kinetic analysis under isothermal conditions at different T. The last part is about stability in time of the system resin and catalyst.

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