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Sealing the exhaust  RSS feed

 
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Well, I have read and read and read some more about rocket stoves and have decided to (finally!) take the plunge and attempt my first build. I have most of the materials I need and have made my first cuts. And now, of course, I have run into a small problem.

I am exhausting into a 4" round duct. I cut a hole in the barrel (this is a 16 gallon barrel by the way) trying to get as tight a fit as possible. For never having made this type of cut, I was pretty proud of my work. My mistake is, the flange is designed to fit onto a flat surface and, as we all know, the side of a barrel is rounded. This leaves gaps around the edge.

My question is, what would be the best way to seal these gaps? I can't really weld it without blowing right through the thin metal of the flange. Is there any type of high-temp silicone sealant that anyone has experience with?

Here is what I have so far:


Any help would be greatly appreciated. Thank you in advance.
 
Posts: 243
Location: near Houston, TX; zone 8b
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Look for a manufacturer of hi-temp epoxy. This stuff is very expensive. Cotronics is one.
 
Scott Farrell
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Cindy Mathieu wrote:Look for a manufacturer of hi-temp epoxy. This stuff is very expensive. Cotronics is one.


Not a huge fan of the 'very expensive' part :(

Next time I cruise through Home Depot I'll take a look at what they have.
 
Cindy Mathieu
Posts: 243
Location: near Houston, TX; zone 8b
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Try the auto parts store. They have some caulk that goes to 600°F

 
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Location: Kansas Zone 6a
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stove sealer. Comes in a tub or a caulk tube, made to seal the joints in cast iron stoves and cheap pipe. It isn't expensive, available anywhere they sell fireplace or stove stuff (including HD this time of year), BUT it sets kind of brittle--turns into more of a low-fired ceramic after heated. Rutland is a common brand.
 
Posts: 185
Location: Southeastern Connecticut, USA
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I took a quick look at Cotronics website. A tube of gasket sealer that fits in a caulk gun is $35. I think the temp goes to 2300 f. Guessing smaller sizes cost less.
 
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