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Forms a tight barrier against fire; smoke and toxic fumes. Suitable for a wide variety of through-penetration fire stops; including cable; metal pipe; insulated pipe; glass pipe; construction gaps; HVAC ductwork and certain plastic pipe applications. Cures to form a flexible seal, installs with a standard caulking gun, pneumatic pumping equipment or putty knife. ASTM, FM and U.L. tested for 3 hour fire penetration seal for walls and floors.