Firewall Holes

[bearingburner]

What are people using to seal penetrations in the fire wall ? We have a 2" sq tube welded on all sides in the firewall through which our wiring harness and control cables pass. We need something to fill the remaining hole. 3 M Technical department says that none of their fire stop materials are for exterior use or with vibrations.

[tauruck]

Post a pic if you can?.

I'm sure there will be some solution to the problem.

[Milwaukee Midget]

Provided you're not trying to fill the Grand Canyon, the 3M Fire Stop product has been accepted.

The question that you need to ask is, would I feel safe with a fire on the other side?

The 3M stuff sticks to just about anything - it's not particularily flexible once set, but if your wires/tubes passing through are properly relieved, and you minimize you holes, it seems to be the filler of choice.

[bearingburner]

Which 3Mfire stop are people using? 3M list many in there web site..

[Stainless1]

We use the oramge clay stuff that comes in a stick... from Grangers

[entropy]

We use the oramge clay stuff that comes in a stick... from Grangers

stainless, do you mean this stuff?

$15.31 / 1.5 x 11" stick
http://www.amazon.com/3M-Fire-Barrier-Modable-Putty/dp/B002FYAMPM/ref=pd_sim_sbs_hi_1?ie=UTF8&refRID=1W0X6VZWPDCNQ6GWERMA
3M Fire Barrier Moldable Putty Stix MP+
A one-part, halogen-free product designed to firestop electrical outlet boxes and a wide variety of through- penetrations including cable, conduit, insulated pipe and metal pipe, which penetrate fire-rated construction.
Features:Used to seal construction gaps, cable (including fiber optic inner duct and cable), insulated pipe, electrical conduit, and metal pipe penetrations against air draft, smoke, noxious gas, and flame propagationPads easily conform and adhere to a wide variety of metallic and non-metallic electrical outlet boxesPutty will not crumble or dry outMeets UL 1479, ASTM E 814Color: Red-Brown What's In The Box:3M MP+ STICK Fire Barrier Moldable Putty Stix

[Stainless1]

http://www.grainger.com/product/3M-Fire-Barrier-Putty-WP11256/_/N-/Ntt-fire+putty?sst=subset&s_pp=false

looks like the same stuff, it stays pliable until it gets hot.... so you can also use it as a body to frame sealer and remove it, roll it back out and put it back on.  
We used the 1 1/2 x 12 Stick.... put it in a zip lock to store it.  

[Richard 2]

This 3M Fire Barrier MP putty I get from the Fastenal store is about $12. It's been on the Roadster for 2 years and is still pliable and moist. Doesn't dry out like the kind you get in a caulking tube.