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December 1998

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Subject:
From:
Andy Magee <[log in to unmask]>
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Date:
Fri, 18 Dec 1998 21:07:26 -0500
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Michael,

Excellent posting. I really appreciate a reasoned approach to an
engineering challenge.

We did quite a bit of work for CERN (Claude-Pierre Marin) a few years
back on coverfilm and adhesive based laminate. The most reliable
adhesive for long term exposure to liquid helium in the ATLAS detector
was phenolic-butyral. (Though it ultimately wasn't selected for other
reasons.) It's stiffness and adhesion properties were very stable at all
cryogenic temperatures.

In a separate study for BEI we discovered that Acrylics were only useful
down to about -35C. At -50C the bond strength was completely
compromised.

Your observations of an "aging" effect may be the result of polymer
oxidation. Also, be careful to investigate the source of the opens. Is
it a lack of support by the coverlay, or simply a failure of the
adhesiveless laminate bond at cryogenic temperatures?

Andy Magee
Flex Guru - Consulting
[log in to unmask]
(937) 435-3629

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