Closed cell sponge rubber can be formulated into several different elastomeric materials in a variety of densities. The most common materials are Neoprene/EPDM/SBR blend, Neoprene, EPDM, and Silicone. Sponge rubber can be specified in low, medium, or high density firmnesses. It is a highly flexible material that can adapt to seal almost any surface application when used with pressure sensitive adhesives or with Heat Activated Tape Systems (HATS).