3M 7000006381 3M, Fire Barrier Moldable Putty Stix MP+, Red, 1.4 in x 11 in, 10/case

The MP+ putty stix is firestop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115. The rating you actually achieve depends on the tested system you build to, but the material itself supports assemblies up to 4 hours.

Yes. The moldable putty forms a draft and cold smoke seal in addition to its firestop function, which is what most smoke-partition and corridor penetrations require.

No. The MP+ putty stix is not a watertight product. Use it for fire, smoke and draft sealing at through-penetrations in rated assemblies, and specify a sealant rated for water immersion or hydrostatic exposure where moisture intrusion is the concern.

No. The putty will not dry out or crumble, so the penetration stays re-enterable and repairable. Pull the putty back, run the additional cable or conduit, then re-pack and remold it around the penetrant.

Each stix measures 1.4 in x 11 in (36 mm x 279 mm), and they ship 10 per case. Because it is moldable rather than a cured sealant, you cut or tear off what a given penetration needs and reuse the rest.

Putty is the better choice where the penetration changes over time or where you need an immediate seal with no cure. The MP+ stix molds by hand into whatever shape the opening needs, stays pliable, and can be reopened when cable is added. A caulk or gunnable sealant makes more sense for fixed penetrations and joints you never intend to reopen. Putty is also the practical pick for retrofitting electrical boxes and cable bundles in occupied buildings, since there is no cure time before the wall is closed up.

It does. The putty carries an STC rating of 56 when tested in an STC 56-rated wall assembly, meaning the sealed penetration does not degrade the acoustic performance of the wall. That matters in hotels, multi-family, and healthcare where sound partitions and rated partitions are the same wall.

Red is the standard visual cue for firestop material, so an inspector can identify a sealed penetration at a glance during a rated-assembly walkthrough. The MP+ stix is supplied in red.

It is built for commercial construction and carries no consumer label. Typical use is an electrical contractor or facility MRO crew firestopping cable, conduit and box penetrations in rated walls and floors. The product is made in the United States.

Order 3M part 7000006381, the Fire Barrier Moldable Putty Stix MP+ in red, 1.4 in x 11 in, packed 10 per case.

3M publishes a regulatory data sheet for the MP+ moldable putty at https://cdmsweb.3m.com/ingredientcommunication/file/Media/gSsiy0-u1uI, which is what most submittal packages and facility EHS reviews ask for alongside the fire test listings.