One-part, intumescent elastomeric strip with foil on one side to firestop metallic and non metallic pipes, insulated pipes and cable bundles. Can be used with the 3M Fire Barrier RC-1 Restricting Collar or with caulk in "in-hole" applications. Documented aging properties. Up to four hours of fire protection. Re-enterable- no special tools required. Can be cut to fit irregular shapes. 24-inch (609mm) strips, one or two inches (25 or 50cm) wide.