>From current discussions about gasification system sealing, I just recalled how we sealed vacuum heat treating vessels that had to be good down to about 10 ^-6 microns or better. We used Quad rings in milled (trepanned) recesses, with vacuum greases applied. These seals were resealable many dozens of times. I don't know about temperature ranges available for them. In our case, we used them on the exterior joints of the vessels where the temps seldom exceeded the boiling point of water. But that was in the 1960's, so I wouldn't be surprised if materials have improved a lot since then. A "Quad ring" is a sort-of square cross section ring, with o-shaped edges. See: http://www.daemar.com/pdfs/118-DMR_Quad-Ring-GrooveDesign_01.pdf for a better look at one style. There are others. Pete Stanaitis -----------------
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