Effects of bonding agents like hexamethylenetetramine-resorcinol system, bis[3-(triethoxysilyl)propyl] tetrasulphide and toluene diisocyanate on the properties of aluminium powder filled nitrile rubber composites were investigated. Shore A hardness, tear strength and tensile properties were increased by the use of bonding agents. Incorporation of aluminium powder increased the thermal conductivity and the resistance towards thermal ageing. Presence of bonding agent decreased the equilibrium swelling due to the improved adhesion between aluminium powder and nitrile rubber.