One-part, intumescent elastomeric strip with foil on one side. Documented aging properties. Can be cut to fit irregular shapes. Up to 4 hours of Fire Protection. Used 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. 24 - inch (609 mm) strips, two inches (50 cm) wide.