This paper describes the investigation of carbon-black filled EPDM by means of (129)Xenon NMR spectroscopy. Unvulcanized elastomer EPDM was filled with three types of commercial available carbon blacks, differing in particle size and specific surface. Xe-129 NMR spectra indicate that Xe atoms are absorbed in the mobile EPDM domains of both filled and unfilled material, In addition, a resonance of Xe adsorbed in the bound rubber fraction has been detected. from the chemical shift and line width of this resonance we conclude that the EPDM chains around the carbon black particles have a strongly diminished mobility.