Residential use only. Used as a chimney block.
3M™ Fire Block Sealant FB 136, a one component, water-based, non-combustible draft, smoke and fireblocking sealant, designed to resist high temperatures and smoke passage in non-rated construction.
Easy clean up with water
Thixotropic (will not sag or run in vertical or overhead applications)
Tack-free in approximately 15 minutes
Applied with standard caulking gun or trowel (high caulk rate)
Typical applications include: sealing interior construction voids around wires, pipes, HVAC ducts and vents, in wood or steel framed non-rated construction. May also be used around chimney, fireplace and other framing gaps. Not for exterior use.