Bonding rubber to metal is a common practice in manufacturing. The bonded rubber created through this process is used for noise and vibration isolation in automotive and engineering applications, among a variety of other applications in other industries as well.
Rubber and metal have very different physical characteristics. When their strengths are united through bonding rubber to metal, the combination results in a product that is strong and rigid yet capable of sealing and absorbing shock. The process rubber to metal bonding involves spraying the bonding agents onto the metal substrate and placing this in a mold where uncured rubber is poured and left to dry. More difficult then it seems, when the rubber has dried the bonded part is done. The molding section requires large amounts of patience because the mold is often just a little bit bigger then the metal part, and must be carefully stabilized while the molten rubber is added. For a part to be properly bonded, it must be completely coated, which means precise placement within the mold and patience as it fills. Certain applications are more difficult to produce then others. For example, small pieces like gears, gaskets and bearings would be easier to manage then heavy and bulky parts such as conveyor belts, industrial pipes and reinforced tires.
Bonding Rubber to Metal - Britech Industries