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Subsea and Marine Applications like this propulsion system for a deep sea submersible are ideal candidates for the RIM process. Not only is the polyurethane material salt water resistant, it can also seal and encapsulate other components into your part. In this example, rare earth magnets are encapsulated as part of the electric motor. If a Polyurethane Structural Foam is used instead of a solid polyurethane, the molded part even becomes buoyant.