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non combustible gasket

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What is the most cost effective non combustible gasket in a barrel and a half system, to gasket between the two barrels. I am modifying a barrel clamp to fasten them together rim to rim. Some one on here suggested I use fiberglass, however I know it will disintigrate in flames, I wasn't sure if it would stand up to barrel temperatures . If So I have plenty of that.
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Phillip, fiberglass or rockwool can hold at thoses temps. It's the binder that fails.

Myself, i just use aluminium tape.

Two layers held with a clamp should hold a while.

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Location: US, East Tennessee, north of Knoxville
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One method that works well is to use traditional wood stove door replacement "fiberglass rope" gasket, held in place with several layers of high temperature aluminum duct tape, and the band clamp over that. I found the fiberglass rope gasket at the local hardware store, but anyplace (home improvement centers) that sells wood stoves, fireplace inserts, and etc. should have it.

For the barrel and a half manifold system, and it depends on the barrels of course, but the ones I used joined together with a better fit by connecting the "lid flange" end of one barrel to the bottom rim end on the other barrel. And as it turned out, modification of the band-clamp was not required.
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