Delastic preformed pavement seals from D.S. Brown are extruded from compounds of neoprene (polychloroprene) which meet or exceed current ASTM standard specifications. They are compressed and remain in contact with the joint walls while allowing the concrete pavement to expand and contract during temperature changes. They are also recognized by the FHWA, U.S. Army Corps of Engineers, the U.S. Air Force, consulting engineers and other agencies as an effective, long-lasting concrete pavement joint seal solution.