3M 7100020738 3M™ Fire Barrier Rated Foam FIP 1-Step, Maroon, 12.85 fl oz Cartridge, (6 Each) Case

The FIP 1-Step foam is firestop tested and rated up to 2 hours, in accordance with ASTM E814 (UL 1479) and CAN/ULC-S115. The actual rating you get on a given opening comes from the specific tested system you build to, so match the penetrant, substrate and annular space to a listed UL system.

Yes, it is rated as a smoke seal. That matters on corridor and stairwell walls where the inspector is checking smoke migration as well as the fire rating. It is not water tight, so do not rely on it for a below-grade or wet-location seal.

Yes. The FIP 1-Step foam stays pliable after installation, so it is re-enterable and repairable. For a data closet or riser where cable counts change, you can push new cable through and patch the foam rather than cutting the whole seal out.

No backing material is required in wall or floor applications. The foam has enough adhesion to hold itself in the opening, which cuts a step compared with sealants that need a packed backer before you tool the caulk.

Each cartridge holds 12.85 fl oz (380.019 ml), and this is sold as a case of six cartridges. Order by the case when you are firestopping a full riser or a floor of penetrations rather than patching one sleeve.

A two-part foam like FIP 1-Step is the choice for large openings and dense cable bundles, because it fills the annular space without a packed backer and can be re-entered when cables change. A firestop caulk or sealant is the better fit for a small single-conduit or small annular-space penetration where you just need to tool a bead. Either way, the assembly has to follow a tested system for the rating you need.

It can be painted over with a primer first. Out of the cartridge it cures maroon, which is the usual firestop identification color and is what an inspector looks for, so many jobs leave it exposed on purpose and only paint it in finished, visible areas.