DUCTMATE Butyl Gaskets - 25 Ft. Roll is a high-performance, permanently soft caulking compound made from virgin butyl rubber. With a temperature range of -40°F to 249°F, this non-corrosive gasket adheres to various surfaces, including steel, aluminum, plastics, wood, and concrete. It offers exceptional flexibility, withstanding movement without cracking, making it perfect for sealing and insulating applications in HVAC systems and construction projects.