[ RadSafe ] Optical Couplant

[Syd H. Levine]

A couple of folks suggested Ludlum.  Sure enuff, they sell the stuff in
small bottles.  I ordered some from them yesterday.

Syd H. Levine
AnaLog Services, Inc.
Phone:  (270) 276-5671
Telefax:  (270) 276-5588
E-mail:  analog at logwell.com
Web URL:  www.logwell.com

----- Original Message ----- 
From: "Alston, Chris" <ALSTONCJ at gunet.georgetown.edu>
To: "Syd H. Levine" <syd.levine at mindspring.com>
Cc: <radsafe at radlab.nl>
Sent: Tuesday, August 25, 2009 2:36 PM
Subject: RE: [ RadSafe ] Optical Couplant


Try Ludlum Measurements; ask for, e.g., Bill Huckabee.

Cheers
cja

-----Original Message-----
From: Syd H. Levine [mailto:syd.levine at mindspring.com]
Sent: Tuesday, August 25, 2009 8:33 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Optical Couplant

Anybody have any leads on the best place to purchase some optical coupling
grease / gel for assembling PMTs and scintillation crystals?  I need a good
grade since we do detectors for oil well logging tools and they are subject
to temperature extremes.

Apparently the old GE G-688 is not available at this time.  Dow Corning
Q2-3067 is available, but they want a small fortune for the stuff.  In fact,
even the secondary sources seem to think the stuff is now worth its weight
in gold since the last time I acquired some.  Anynbody use the Visilox (now
made by Blue Star) product and have an opinion how it compares to the GE or
Dow material?

A couple of ounces lasts us for years and years, and in fact we still have
plenty of the material, but it is so old, I am supicious of its "goodness".
I have most of a 4 oz. bottle of Q2-3067, but while it is still clear and
the proper consistency, it has taken on a slight amber hue.  I also have an
old bottle of Bicron material from long before the Saint-Gobain days, and it
is still water clear, but has the consistency of stiff jello, hard to work
with.

Thanks.

Syd H. Levine
AnaLog Services, Inc.
Phone:  (270) 276-5671
Telefax:  (270) 276-5588
E-mail:  analog at logwell.com
Web URL:  www.logwell.com




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