[en] This work aimed to evaluate the influence of aging processes generated by biodiesel, through immersion tests in different times (1000, 3000 and 5000 hours) and temperatures (23 and 100°C), on the mechanical properties of a commercial polyamide 12 used for fuel hoses manufacturing. Specimens were injection molded, aged and further characterized by FTIR, XRD and tensile and impact strength tests. FTIR analysis indicated a possible thermo-oxidative degradation mainly for the aging carried out at 100°C. The XRD spectra indicated an increase in the surface crystallinity of the specimens with increasing aging time for the aging carried out at 100°C. The tensile strength and elastic modulus of PA12 samples aged at 23°C decreased with increasing aging time. For the aging carried out at 100°C, the tensile strength and elastic modulus increased with aging time. The impact strength at -40°C of PA12 presented different behaviors when aged at room temperature and 100°C. (author)