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but does it reduce the temp on the cold side down to 250?
----- Original Message -----
Sent: Sunday, December 20, 2009 7:34
PM
Subject: [LML] Re: Intumescent firwall
coating
Colyn,
If the firewall is flat, multiple layers of fiberfrax (2 or 3
of 1/8" thick sheets) with stainless facing seems appropriate for
the 300 series. It not only protects the glass resin, but also the
wooden plywood firewall core.
Perhaps this would work with some tailoring for those with exhaust
tunnels - On the other hand, the turbine firewall is a piece of 3-D abstract
art.
Grayhawk
In a message dated 12/20/2009 6:51:33 A.M. Central Standard Time,
colyncase@earthlink.net writes:
Bad data alert!!! (pardon the
email yelling Scotty).
The data below is for 3m Nextel ceramic
cloth. I have not been able to obtain any hot side/cold side
data for the Thermo-Lag 3000 or any other intumescent.
My take away so far is that you need to build
something that has high insulating properties and will hang together to the
cold side temp of the barrier whatever you are
using..... So depending on what
you use for a barrier you still have to deal with 500 dF to 1000
dF.
Anyone have a suggestion?
----- Original Message -----
Sent: Sunday, December 20, 2009 2:36
AM
Subject: [LML] Intumescent firwall
coating
And now with the
data of hot/cold side temperatures for intumescents, I may have to go back
to the stainless/fiberfrax as the preferred combination although I don’t
have any data on that at all.
It may be I have to
put an intumescent coating on top of the stainless/fiberfrax original or
under those. My firewall is glass/plywood/glass so it might not be as
scary as softening honeycomb. Yeah, I think I’ll believe that so I can
move forward. Feel much better now.
Jim
From:
Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of mikeeasley
Sent: Friday, December 18, 2009 9:52
AM
To:
lml@lancaironline.net
Subject: [LML] Re: Intumescent
firwall coating
It seems that the firewall
blanket has to serve two purposes, one to keep the fire from penetrating
the firewall, and two to keep the heat from softening the firewall.
If I read the chart correctly, you would start softening the firewall at
about 500F in the engine compartment, since the 3M material cuts the temp
in about half.
In a message dated 12/18/09 08:19:52 Mountain
Standard Time, colyncase@earthlink.net writes:
Here's a document of the
sort I was hoping to find for the intumescent
paint.
It shows hot face vs. cold
face temperature.
Based on the original, it
seems to me that is the worry. e.g. the firewall gets soft
somewhere above 250.
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