In this study, the effect of processing cycles and two Pollutants (engine oil (HM) and ethylene glycol (EG)) on the thermal and rheological properties of polypropylene-based materials (108MF97 and 7510) has been studied. It was investigated if polymers coming from bumper face bar Could keep their properties and can be reused after recycling. The different results demonstrate that the two Polymers that were polluted and recycled do not show any decrease of their intrinsic properties. Moreover, for one of the two polymers (108MF97), the presence of engine oil enables to increase the thermal stability and reaction to fire. Finally, it appears that the reuse Of such polymers is possible. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2270-2279, 2009