Thermofelt 615 carbon felt welding blanket

[briank]

Hi folks,
One of the materials being used among the diy alcohol camping stove makers is carbon felt. It's relatively cheap and has good max temp:

"Tillman Welding Blanket - Thermofelt 615

Soft, thick, affordable welding blanket provides protection up to 3000F. 16 oz. Black Thermofelt material is non-flammable, non-melting, non-shrinking and scratch free!

No heat transfer takes place between the blanket and the protected surface, making it ideal for auto body and other thin sheet metal surfaces.

With a working temperature of 1800F, this blanket is a safety must for the auto body mechanic or the home hobbyist. It is available in 2 sizes, either 3' X 3' or 6' X 6'."

A 3'x3' blanket is only $23 at store.cyberweld.com/panfelwelbla.html

This stuff is soft and flexible but fairly tough. Does anyone have any experience with it? I wonder if it could be used to line the inside and outside of a 6" riser? I'm just not certain how it could be held in place unless it was used to line clay portions and a short section was expended beyond 1' sections and held in place by the seams, or wrapped around the inner face of vermiculite board?

Just thinking out loud...

[briank]

On further reading here it appears the ceramic blankets with hardener is the better route.

[Vortex]

Why did you come to that conclusion?

[briank]

Jan 3, 2016 3:23:39 GMT -8 Vortex said:

Why did you come to that conclusion?

Because someone has already successfully done it:

donkey32.proboards.com/thread/1049/small-diameter-backup-supply-works

See the 6th post on the page.

The ceramic blanket has a better (higher) working temp and there are commercial rigidizers on the market which appear to work well.

[ronyon]

Watching Robert Murray-Smith use carbon felt on youtube led me to this thread.
I googled "carbon felt rocket stove riser" and of course this was the place that had explored the idea first!

Lots of stuff has happened since this thread was started.
The 5 minute riser is an established norm for rocket stoves, and I think the potential dangers of even the "safe" ceramic insulation are widely accepted.
The welding blankest are very cheap and seemingly less hazardous, and 5 minute risers show that not much stiffening needs to be done to use a fabric in a rocket stove.