I am looking for a company to manufacture EPDM sponge material in an extrusion. Extrusion configuration would be approximately 12" wide x 1/2" thick tapered to 1/4" and as long as possible (50'?)
Derby Cellular in Derby, Connecticut, makes EPDM sponge for automotive applications, perhaps they can help you. If not, get back to me and I'll see who else is out there.