The different transitions involved in the thermal processing and decomposition of cross-linked ethylene vinyl acetate-polyethylene (EVA-PE) mixtures, with different concentrations of PE and peroximon (cross-linking agent), have been analyzed and simultaneously modeled by the application of a mechanistic pseudokinetic model. The model suggested involves all of the fractions susceptible of undergoing transitions or reactions studied by differential scanning calorimetry and thermogravimetric analysis, including complex and overlapped peaks. The model applied is capable of accurately representing the different processes involved and can be of great interest in the understanding and quantification of such phenomena, including the modeling of heat effects involved in the whole processing or pyrolysis of this type of product.