High Vacuum Epoxy

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Article #211

#211

From: Dan Koller*
Date: Thu, 20 Aug 1992 15:46

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   Does anybody know the absolute ultimate lowest obtainable outgass
rate of Varian's "Torr-Seal" high vacuum epoxy?  Varian Spec. sheets 
only list confusing figures, after short 130 degree bakeouts.  I would
like to know if baking out for a week or so at 130 deg. C will help
bring the outgass rate below 10e-8 Torr-liter/cm^2/second.
   I would like to use the epoxy to seal sapphire windows to a small
(1 cm^3) glass chamber, pump it down to better than 10e-7 torr, and then
seal it off.  The problem is that the epoxy seems to be outgassing at
a rate high enough to bring the pressure to 1 mTorr in a minute or so.
This is to be expected from Varian's published outgass rates, but my
question is, can I do better?
   Finally, if epoxy won't work, is there a better way of attaching 
sapphire or Silicon windows to glass?
   Thanks in advance.
							Danube

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From: danube@dirac.physics.sunysb.edu (Dan Koller*)
Subject: High Vacuum Epoxy
Organization: Institute for Theoretical Physics, SUNY at Stony Brook
Date: Thu, 20 Aug 1992 15:46:26 GMT
Message-ID: <1992Aug20.154626.20676@dirac.physics.sunysb.edu>
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