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Firewall insulation

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Ed Godfrey

Joined: 05 May 2009
Posts: 47

Posted: Mon Mar 11, 2013 5:49 pm Post subject: Firewall insulation

All,

     I am trying to make a decision as to a decent method of firewall 

insulation. I have looked through the arhives and have seen where some 

have used a Fiberfrax type of material and some have used a foam 

material. Is there anything that might not be a good idea to use bot the 

Fiberfrax as a thermal insulation and a foam insulation for acoustic?Any 

thoughts would be greatly appreciated.



Ed Godfrey

40717

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Tue Mar 12, 2013 1:51 am Post subject: Firewall insulation

Ed,



You need to read the thread in the VAF archives about Dan horton's testing of all the materials.  



Unfortunately, as Ted found out, that black foam insulation turns into caustic black smoke pretty quickly.   I wouldn't use it on the firewall or tunnel.  I did use the black foam in areas that most likely would be exposed to flames in flight, like the side walls.   



I used fiberfrax in the tunnel.  On the firewall I used a product from acs that is a ceramic blanket with stainless foil on the firewall side and aluminum foil on the aft side.



There is no 100% answer here.  You need to determine the best way to mitigate the risk of heat/fire, since many of the solutions introduce other risks if implemented.



Bob



Sent from my iPad



On Mar 11, 2013, at 9:48 PM, Ed Godfrey <egodfrey(at)ameritech.net> wrote:



 	  Quote: 	
		   

 

 All,

    I am trying to make a decision as to a decent method of firewall insulation. I have looked through the arhives and have seen where some have used a Fiberfrax type of material and some have used a foam material. Is there anything that might not be a good idea to use bot the Fiberfrax as a thermal insulation and a foam insulation for acoustic?Any thoughts would be greatly appreciated.

 

 Ed Godfrey

 40717

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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

carl.froehlich(at)verizon
Guest

Posted: Tue Mar 12, 2013 5:55 am Post subject: Firewall insulation

I used the this and like it:

http://www.aircraftspruce.com/catalog/appages/insulator3.php

The double sided, one layer thick is fine.



Get the aluminum foil tape to install:

http://www.aircraftspruce.com/catalog/appages/insultape.php



I used this insulation on the inside of the firewall, all floors and

sidewalls (with an interior fabric covering the cabin side of the insulation

for areas not enclosed).  I did not use it for the cabin top (I found a nice

marine grade upholstery product for that).  I have this on the bottom of the

tunnel but not the sides.  I have not experienced any issues with tunnel

heat.  I have some KoolMat

http://www.aircraftspruce.com/pages/ap/insulation/koolmat.php on the

firewall.  It is between the cabin heat control valves and the firewall,

then extents up and over the top of the valves.  The idea is to not blast

the engine and fuel pump with hot heat muff air that bounces off the valves

back toward the engine when the valves are shut (on hot days when you least

want hot air banging on the fuel pump).  So the KoolMat insulates some

thermal heat transfer to the firewall, and looping the KoolMat over the top

and then down in front of the valves directs the dumped heat muff air down

and away from the engine.



I know one RV-10 builder who used the black foam in the floor area that had

to pull it out - it started to smell up the airplane when it got warm.



Carl 



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