Colyn,

 

Yes.  Fiberfrax is good at temps to 2600F.  See http://www.fiberfrax.com/ .

 

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

 

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 -----

From: Jim Nordin

To: lml@lancaironline.net

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

Colyn,

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.

Mike Easley

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.

http://www.3m.com/market/industrial/ceramics/pdfs/hotface_cold%20face.pdf

the home page is here:

http://www.3m.com/market/industrial/ceramics/materials/fabric_312_aero.html