I've used a thin coating of high-viscosity vacuum grease (eg Dow Corning 976V or
Apiezon) on the O-ring for a similar purpose (though not in that tool
specifically).  Standard caveat: make sure the grease you choose is compatible
with your process conditions, and make sure to precondition your vacuum system
when adding the grease before running the tool with your precious samples in it.

On Jul 26, 2012, at 10:26, Ned Flanders wrote:

> Hi all,
>
>
> we have a Bal-Tec SCD 050 sputter which we use to coat a bit of gold
> on samples for SEM analysis. The o-ring that is inserted in the groove
> in the lid, keeps falling out and makes the use of the device
> unpleasant/impractical.
>
> I though a bit of vacuum pump oil might help to keep the o-ring in
> place (by sheer surface tension).
>
>
>
> Good idea or bad idea?

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