If you need to firestop smaller cable penetrations, construction gaps, or openings in electrical boxes but are tired of dealing with some of the messier caulks and foams out there, then I think you’re going to like today’s featured product. My attention was recently caught by SpecSeal® SSP Putty from STI, a clay-like firestopping agent that can be applied without tools or mess. Like I said, this putty is very malleable, just like clay, so all you need to do is work it into openings with your hands, instead of hauling out a caulk gun or trowel. Sounds nice and easy, right?
It is. But no-hassle installation is only one of the benefits of SpecSeal® putty. First of all, it has very strong adhesive properties, so it sticks really well to just about any type of building material, as well as pipes, conduit, and cable jackets. Next, it goes through a two-stage intumescence process when exposed to fire, meaning that it swells (to up to 8 times its original size) to create a gap-free barrier to block the passage of smoke, flame, water, and fumes. As a matter of fact, it’s even great at blocking noise, which makes it ideal for soundproofing as well.
If you’ve ever firestopped with caulk or foam, you’ve probably found that once it dries, that’s it. If you need to make any changes, you need to pull out all of the cured intumescent material, update your cabling and make any other necessary modifications, and then refill gaps with a fresh application of foam or caulk. But one of the really interesting features of SpecSeal® is that it never dries or hardens, so it’s reworkable at any time. This can save you money in the long run, because you don’t have to invest in new firestopping putty every time you need to update a cable configuration. And even though it doesn’t dry, it stays put, so you don’t have to worry about it falling or sagging out of place. In addition, there’s no “cure time,” so you don’t have to wait hours for it to become fully effective – it’s ready to go from the start.
SpecSeal® SSP Putty is rated for up to 3 hours of fire protection, per the requirements of ASTM E 119.