Heatshielding
Mon Feb 22, 2010 6:43 pm
I know a few of you are aircraft mechanics and can possibly help me out with a question .
I need some really high temperature heatshielding . I know aircraft grade is generally stronger than automotive applications so I thought Id ask here first .
In the older days asbsestos use to be common but now days its completely gone . What would be something else I could use , preferably like a plate that I can bolt onto the body that would stop exhaust heat from melting plastics ? or is automotive stuff now the best stuff available .
This is the kinda stuff Im refering too :
I need some really high temperature heatshielding . I know aircraft grade is generally stronger than automotive applications so I thought Id ask here first .
In the older days asbsestos use to be common but now days its completely gone . What would be something else I could use , preferably like a plate that I can bolt onto the body that would stop exhaust heat from melting plastics ? or is automotive stuff now the best stuff available .
This is the kinda stuff Im refering too :
Re: Heatshielding
Mon Feb 22, 2010 10:10 pm
I've used two different products.
Fiberfrax, which is a ceramic fabric you can glue to the surface you're trying to protect.
http://www.aircraftspruce.com/search/se ... x&search=1
Koolmat, which is fiberglass with a vinyl (?) coating.
http://www.aircraftspruce.com/search/se ... t&search=1
The spec's show Fiberfrax is good to 2300F and Koolmat is good to 1000F. Both glue to the hot side of whatever you're trying to protect. Fiberfrax has a special adhesive, Koolmat is typically attached using RTV.
If you have a really high temp situation, you could always create a stand-off and put a stainless shield with an air gap between it and what you're protecting. If that wasn't enough, you could add a layer of one of the insulating products behind the stainless shield.
Fiberfrax, which is a ceramic fabric you can glue to the surface you're trying to protect.
http://www.aircraftspruce.com/search/se ... x&search=1
Koolmat, which is fiberglass with a vinyl (?) coating.
http://www.aircraftspruce.com/search/se ... t&search=1
The spec's show Fiberfrax is good to 2300F and Koolmat is good to 1000F. Both glue to the hot side of whatever you're trying to protect. Fiberfrax has a special adhesive, Koolmat is typically attached using RTV.
If you have a really high temp situation, you could always create a stand-off and put a stainless shield with an air gap between it and what you're protecting. If that wasn't enough, you could add a layer of one of the insulating products behind the stainless shield.
Re: Heatshielding
Mon Feb 22, 2010 11:12 pm
Unless you are in direct contact with flame (like in a firewall application) you can use fiberglass cloth sandwiched between thin stainless steel sheets or foil.
The old glasspack hot rod mufflers used fiberglass mat inside demonstrating that fiberglass can withstand quite a bit of heat.
You can also hand sew sew plies of fiberglass cloth together with cotton (or even fiberglass) thread and then stitch it into place with safety wire.
The old glasspack hot rod mufflers used fiberglass mat inside demonstrating that fiberglass can withstand quite a bit of heat.
You can also hand sew sew plies of fiberglass cloth together with cotton (or even fiberglass) thread and then stitch it into place with safety wire.