🚀 go-pugleaf

In article <1992Aug20.154626.20676@dirac.physics.sunysb.edu> danube@dirac.physics.sunysb.edu (Dan Koller*) writes:
>
>   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

It has been awhile since I worked on a vacuum bench, but I am
reasonably sure that someone makes a special wax that can be
used for gluing things together.  This wax was designed for
high vacuum work.  I have no idea where you can get it.

Ride Free,

Bill
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