Will VacSeal hold for a 10^-7 torr vacuum if it is applied from the inside?

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Phil Denby

It would normally not be recommended to put such things on the inside of the vacuum chamber, as it exposes a large surface area of the material for out-gassing and could well ruin the attainable pressure (particularly in the high vacuum region of

10^-7 torr you mention). If there really is no alternative - sealing from the outside, or welding, then try it. It is unlikely that atmospheric pressure will be enough to force the material out of a leak, if you are able to get it to penetrate. Assuming it is a minor leak (not a hissing great hole), and a reasonable vacuum can still be obtained.

James Garry

Leon,

Intrigued - what stops you from accessing the leak from the outside?

I presume that you've waved a leak detector at the chamber?

Virendra Nath Rai

In principle it seems all right but it is preferable to put any seal from outside if possible in the case of high vacuum like 10^-7 torr. Putting seal inside will not be long lasting even if it is not out gassing.