Effects of various bonding agents-such as the hexamethylene tetramineresorcinol system (HR), bis[3-(triethoxysilyl)propyl] tetra sulfide (Si-69), and cobalt naphthenate (CoN)-on the mechanical properties of aluminum powder filled styrene butadiene rubber composites were studied, giving emphasis on concentration of bonding agent and loading of aluminum powder. Shore A hardness, modulus, tensile strength, tear strength, heat buildup, etc., were increased by the loading of aluminum powder, and the presence of bonding agents again increased these properties. Rebound resilience and elongation at break were decreased by the addition of aluminum powder. Equilibrium swelling studies showed an improved adhesion between aluminum powder and styrene butadiene rubber (SBR) in presence of bonding agents. Among the various bonding agents used in this study, silane coupling agent (Si-69) and hexamethylene tetramine-resorcinol (HR) system were found to be better for aluminum powder filled SBR vulcanizates.