Rubber Extrusions: Closed cell sponge extrusions are available in standard and custom dies. EPDM, Neoprene, Nitrile and Silicone compounds are available. (Note Die ID Key, below indicating make up of stock dies.) The extrusions are available in continuous lengths and intricate profile shapes, but can be cut to length to meet your specifications. Our vulcanizing service offers you the option to shape the extrusion to meet your application around windows, doors and other seal requirements.