A new composite based on natural rubber vulcanizates loaded with the newly prepared iron oxide-aluminum oxide ((Fe2O3Al2O3)-Al-.) fillers were prepared and their physical and magnetic studies were investigated. The prepared fillers were evaluated as reinforcing fillers with some magnetic properties; these properties were dependent on the ratio of iron oxide to aluminum oxide in each prepared ratio of these fillers. Rheological properties of rubber mixes containing (1Fe(2)O(3):3Al(2)O(3)) and (1Fe(2)O(3):1Al(2)O(3)) fillers exhibited better properties than mixes containing (3Fe(2)O(3):1Al(2)O(3)) and (alpha-Fe2O3), which showed almost the same behavior. Physical properties such as tensile strength, stress at 100 and 200% strain, Young's modulus, and hardness were increased by increasing the volume fraction of the investigated fillers concentration in the mixed vulcanizates. Measured rheological and physical results were inversely related to the magnetic properties. (c) 2006 Wiley Periodicals, lnc.