Heat Sheilding Material

[Ryce Stallings]

Does anyone know what material can be used for heat shielding a rear bumper? If so who sells it?

See the attached image to get the idea.

[Danny_Ocean]

Something along the lines of Dynamat would work. Be sure, whatever you get, is rated for exterior use:

http://www.dynamat.com/products_intro.html

[moneymanager]

Pegasus. On the web. Heat shielding aluminum foil. But you'll need a metal deflector too. Do a search on this problem; others have gone before.

[tcar]

Don't think dynamat works in that situation.

Should be reflective.

What are you trying to do? Keep the rear bumper from getting hot?

[RLJ]

I saw a fella take stainless steel shim stock, a roll about a foot wide. Cut pieces, like five or six to length, went out in the driveway on the crushed gravel layed down the tin and walked on it with soft shoes. This put little bumps in the tin so when they were stacked side by side there was some air gap between them. It worked pretty well. He was going to add a layer or cera wool (cloth pad made from spun ceramic material) but he didn't need to.

~Randy

[RWebb]

A Randy has given you the best idea yet (natch).

When tcar says "reflective" he is talking about radiative heat transfer. Once it gets dirty, it won't reflect heat (IR) well anymore.

Heat transfer to the bumper also takes place by convection (we can neglect other routes, as they will be minuscule.). You can either try to duct cool air in, or set up a barrier to keep the hot air out. The layers with air or other insulator in between will help with everything.

If you have deep deep pockets and want to help Sherwood put his dog thru college, you can buy his titanium heat sheets and stack them up with spacers, insulation or dimples as spacers. Ti has a very low thermal conductivity for a metal, and tends to stay reflective (won't oxidize) longer than others (except gold, which NASA used on the lunar lander). Stainless is your 2nd choice. Al ought to be ok too.

I use nothing on mine - in an old thread, Bill V. noted that usually only a turbo needs a shield.

[Danny_Ocean]

Originally Posted by tcar

Don't think dynamat works in that situation.

Should be reflective.

They (I think it is Dynamat) make a product that is reflective & self-adhesive. It is for mounting under (exterior) the "tranny hump" typical in American cars to keep heat from entering through the tranny tunnel.

[moneymanager]

You guys are making a simple problem kind of challenging. Some heat deflecting material on the bumper, and a simple sheet of aluminum on a bracket secured by the existing muffler supports will do it. Here's a bad pic showing how the aluminum sheet mounts on one side...you need both sides of course. With care you can produce a much higher quality product than that shown here! $10, an hour's work, plus stick-on heat deflector material.

[johncmng]

Have anyone tried Carbon Fibre. There have excellent insulation qualities.

[KTL]

A bought some silica fabric for my fiberglass bumper but I have not installed it yet to see how well it stays in place and performs.

http://www.mcmaster.com/nav/enter.asp?pagenum=3141

Still trying to think of a good way to attach it to the bumper.

[Ryce Stallings]

After posting this I Googled in auto heat shielding material. The first return was heatshieldmaterial.com and they have all types of material. The stuff isn't that cheap.

They have all kinds of applications and temperature ranges including specialized race car applications.

[Rob Channell]

Hoerr Racing Products has several heat protection products.
http://www.hrpworld.com/index.cfm?form_cat_id=66,7,363&action=category

Here's one:
http://www.hrpworld.com/index.cfm?form_prod_id=66,7,363_4252&action=product

I'm not sure which one is best but let us know what you find that works.

[KTL]

Oops. Sorry guys. I posted the wrong page number.

Here is the correct page number.

http://www.mcmaster.com/nav/enter.asp?pagenum=3411

You can see the stuff I have is the same silica materia stuff as ThermoTec, just not aluminum covered. It's cheaper at McMaster

Originally Posted by KTL

A bought some silica fabric for my fiberglass bumper but I have not installed it yet to see how well it stays in place and performs.

http://www.mcmaster.com/nav/enter.asp?pagenum=3141

Still trying to think of a good way to attach it to the bumper.

[javadog]

There's another active thread on this subject here:

Melting Fiberglass Bumpers?

JR

[Jack Olsen]

I think the other active thread is my fault. I did a search on what I'd used, and then posted the reply in one of the threads that came up in my search.


Here's the post:

The $20 solution works fine and is from J.C. Whitney.

[RWebb]

I am cross-linking the 2 threads on this topic for ease of eventual Wiki-ization...


Melting Fiberglass Bumpers?