The interest of mixing PVC-C and EVA with different concentrations (5-10-15-20%) is to combine the useful properties to develop a product resistant to thermal aging and gamma rays up to 50KGy. In this study, the effect of aging on mechanical properties (tensile strength, elongation at break and Young modulus) and the changes induced in the thermal analysis and morphology due to gamma radiation was investigated. The results revealed that the gamma irradiation affected considerably the PVC-C properties at 50KGy. This degradation is due to the chain scission, which caused a reduction in the average molecular weight and cross-linking rate on the one hand, but this degradation was not observed in PVC-C/EVA/20%.