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Date: | Mon, 13 Aug 2007 14:46:57 -0700 |
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Consider the PTFE material from W.L. Gore
Very low moisture absorption if I remember correctly and good dimensional
properties too.
Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930
Dan Skweres <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
08/13/2007 12:25 PM
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[TN] Another Request.
Fellow Technetters,
I have another request from a customer that I do not have an immediate
answer(s) for. Once again I was hoping that with the wealth of knowledge
you collectively have that perhaps you could assist me in assisting my
customer. They need a circuit board that...
a.. Will reside within a float assembly of a gyroscope.
b.. The environment will consist of hydrogen with trace helium.
c.. A concern is the moisture absorption or adsorption, the hygroscopic
properties, of the circuit materials used in the stackup.
They're searching for materials with extremely low coefficients of
hygroscopic expansion and contraction, CHE and CHC. The board needs to
maintain stable electrical, mechanical and dimensional properties. Is it
generally better to go with a rigid design rather than a flex design when
concerned with the affects of ambient moisture?
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