Date: Wed, 22 Mar 95 14:00:22 CST
Subject: 2 different view about Transoptic mount
From:
Status: OR
Date: Wed, 22 Mar 1995 10:30:06 +0000
From: jdonovan@seismo.berkeley.edu (John J. Donovan)
Subject: Re: Question about sample mounting medium
Well it's pretty obvious that using a compressed powder as a mounting
medium will create an enormous virtual leak (as opposed to a real leak to
atmosphere). It will probably take years to pump out.
john
====================================================================
John J. Donovan jdonovan@seismo.berkeley.edu
MicroProbe Laboratory jdonovan@garnet.berkeley.edu
Room 455, McCone Hall
University of California Voice : (510) 642-5459
Berkeley, CA, 94720 FAX : (510) 643-9980
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Date: Wed, 22 Mar 1995 11:50:55 -0600
From: miltonp@ruf.rice.edu (Milton L. Pierson)
Subject: Re: Question about sample mounting medium
I have had Material Scientists bring samples mounted in that stuff or
something very similar (plastic that sets under pressure). The samples in
this took a very long time to even pass the airlock pumping sequence. At
first I too thought we had a problem with the vacuum system, but when I put
our standard block in the airlock, it pumped down as fast as it ever does.
The solution seems to be Do Not use the easy to use pressure set medium
because it outgasses something and wastes a lot of time. Even after
overnight pumping our vacuum reaches SCOL 2E-4 at best with this stuff in
the specimen chamber.
Milt
Milton Pierson e-mail: miltonp@ruf.rice.edu
Microprobe and X-Ray Lab Technician phone: (713)527-8101ext.3319
Rice University, Geology & Geophysics fax: (713)285-5214
6100 S. Main St. MS 126
Houston TX, 77005-1892
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Date: Wed, 22 Mar 1995 12:53:28 -0500 (CDT)
From: GMORGAN@geoadm.gcn.uoknor.edu
Subject: Re: Question about sample mounting medium
Mati Raudsepp inquired about using Transoptic mounting media (presumably
from
Buehler). I've been using it routinely for years without any sample
outgassing
problems.
George Morgan
University of Oklahoma