High Temp Insulation

Aerogels

thank You !

Lee

What is "thin"?

Polyimide film will take the heat, and I think you can get foam sheets.

Lyn:

thin is defined as >0.25"...will be used to shield a cylinder 2" Diameter by 4" in length

that has 400 Deg F in the shell but needs to be >104 Deg F on the outside after insulation to meet maximum skin temperature spec.

thanks

lee

Quick and dirty: Exhaust Wrap - Summit Racing It's roughly .0625 thick. And it comes in various widths including 4".

You don't say what R value.

outstanding, thanks for the help;

Lee

Take a few more steps away from the heat source, using that 'thin insulation material' called air. Alternatively, get a mate with a small thin stature to stand between you and the heat source.

Depending on the area of the heat source, make the temp of the heat source lower by solid state cooling, a better design with less heat output or switch the heat source off and on, on a regular basis, so the temperature does not build up.

I do not believe that either response that received a GA vote here is deserving of such a vote.

I am canceling the GA that I received.

Don from Oz, one of us doesn't understand the request.

Insulation (distance or insulation materials), and/or heat removal (temporary or permanent), is what I suggested. Have another read of #9.

CR4 is a mix of responses from engineers, designers and keen enthusiasts with an open way of thinking and considering alternatives, even yours, and sometimes with tongue in cheek. As for cancelling the GA that your received ... that's your choice.

Even I would assume that the OP would have discovered, by now, that backing away from the heat source would reduce the radiant energy striking the skin.

The radiant area is a 2 inch diameter cylinder, 4 inches high, heated to 400°F.

Even someone of my meager intelligence can recognize that a such a cylinder, at 400°F does not have the area to radiate much heat. That leaves us with conduction and convection as a heat source. Once again, not much energy there.

So, we are left holding the cylinder in our hands, thus the reference to "skin" in the original post.

Only the OP knows for sure.

Your points are well made. Yet again, (as someone asked), a picture would be helpful to better explain the original issue.

With safety inmind, an exposed extra hot and dangerous situation is a poor starting point. Protective guards and the like should be in place from the outset as part of the original design. The question should never have even been proposed.

As you say we don't know enough. Par for the course.

I think the question is OK.

I do not have a picture but here is the application...I am a former USAF PJ, pararescue combat. Noet O2 pressurized cylinders are walking IED's !

I am taking a Standard Chem Oxygen generator from about 5 different commercial sources and want to insulate it so when it's fired off, it can be used on the battlefield to supply O2.....BUT it connot get next to skin sincde the metal alum can heats up to about 400 Deg F. on the outside.

Standard Commercial Generator Like the ones over your head in a commercial aircraft

are about 5 " long and cylinderical with about 3 inches in diameter...

I hope I have answered everything if more is needed let me know ?

http://www.airsep.com/medical/freestyle.html

The above is one of many personal small oxygen concentrators that is wearable.
Does this solve the application that you want?

NO, it is way too big...my unit is only 2-3" in diameter and >6" in length...weights 2 lbs. when activated, it generates 4-6 lpm for 30 minutrs and more importanly fits in an armpit or groin on the battlefield....thanks for trying though....

So does the above already fit the requirement?

I do not know the tech detail of the above, but if similar in principle to
what you are seeking, then look at how they did the heat insulation.

Lyn is right about the exhaust header wrap.

I wrap all the exhaust pipes on my motorcycles where they might come into contact with any part of me if I happen to end up underneath them on the side of the trail or road which happens more often than you might think. :) Exhaust pipe temps always exceed 700F+ near the engine head and if wrapped correctly creating a double layer they are 'cool' enough to lay your bare hand on them.

I would say a pouch sewn of 3 layers of the header wrap material, which can be bought in sheets too, would more than take care of 400F temps in direct contact with bare skin. Choice of sewing thread here is critical to keeping it together!