nuckolls.bob(at)aeroelect
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 Posted: Sat Dec 19, 2020 4:03 pm Post subject: Has anyone used very high temp silicone FWF? |
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| Quote: | Which one? It seems there are multiple threads going, and some of us are using email (I am, anyway) and others are using the web based list, so I don't know which product you're talking about. The F-B-2000? If so, it would seem that you're probably right, since they're so vague with info. They do claim 1000F+ for the CP 25 WP+ intumescent caulk. Spec sheet attached, showing that the intumescent action happens at 1000 degrees F.
For simple seam sealing, if we're realistic, just about anything would be fine, like Ernest said. The latex based intumescent stuff (CP25WP+) is much cheaper, and ideal for filling empty space around wires, etc in holes, but even that is probably overkill if you use the firesleeve/hose clamp method Bob linked.
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It's been some time since I read the qualification testing
docs for firewall integrity so I might be in error. I have
witnessed a couple of tests conducted by the famous Jack
Thurman and his trusty fire-breathing dragon.
A mock firewall sheet is fitted with the proposed feed
thru system. A propane fired burner is positioned a
few feet off the front side of the firewall. A thermocouple
is positioned about 6" off the firewall right in front
of the test article.
The test setup is bathed in propane powered flame
sufficient to push the thermocouple reading to 2000
plus or minus a hundred or so degrees . . . for
ten minutes.
After everything cools down, the feedthru is
disassembled and inspected for depth of penetration
into the assembly with some criteria for maximum
allowed charring, etc of the wiring.
The sealants being discussed are, no doubt, suitable
for intended purposes of closing voids around pipes
and/or bundles of wires that penetrate walls
in structures . . . I'm having trouble wrapping my
head around any perceived similarities between a
.030" thick sheet of stainless and a 6" concrete
or cinder block wall.
I'll be the first to agree that chances of being
at-risk from a fuel-fed fire in your airplane
is really pretty low . . . but not zero. But to
fill your comfort basket with the knowledge
nuggets of a completely unrelated approach
to fire control seems extra-ordinarily
risky too.
I'll see if I can scare up a service manual
or two for some TC aircraft in search of
a narrative on replacement/modification of
qualified firewall feed thrus.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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