From a fatherly guidance point of view, I could not help but notice that
you used "conformal coating" and "silicone grease" in the same
paragraph, which is wayyyy too close for my comfort.  I always have
preferred not to see them anywhere close to each other, much less on the
same assembly.

Phil
--------------------------------------------------
From: "Carl VanWormer" <[log in to unmask]>
Sent: den 23 August 2010 19:52
To: <[log in to unmask]>
Subject: [TN] humid environments and long term reliability

> We are considering conformal coating our boards that will go into a
> chassis that may be an occasional high humidity environment.  I have
> been told that the humidity (and water) is "slowed down" by the
> conformal coating, and that good cleaning before the conformal coating
> is essential for reliability.  Assuming we have done all we can do for
> the PC board assembly, my worry goes to the next level; the cables
that
> connect between boards and also to the valves, relays, and sensors.
Is
> it worth considering messing up the system with silicone grease
smeared
> on all of the 2-pin, 5-pin, and 50 pin (IDC) plugs and sockets?  I
know
> some of the cute little phone-wire crimp-on IDC button connectors are
> filled with a dielectric grease, so it must have some value.  And what
> about the IDC connector, with its pins just piercing the ribbon cable
.
> . .  Is there a long term reliability problem there, too?
>
>
>
> I'm looking for "fatherly guidance" on making a system that won't ever
> need a field service call.
>
>
>
> Thanks for tolerating my paranoia,
>
> Carl
>
>
>
>
>
>
>
> Carl Van Wormer, P.E., AE7GD
>
> Senior Hardware Engineer
>
> Cipher Systems
>
> 1800 NW 169th Place, Suite B-100
>
> Beaverton, OR  97006
>
> Cipher Systems (503) 617-7447 x 5163
>
> Direct Line (503) 425-5163
>
> [log in to unmask]
>
> This message may contain confidential and/or proprietary information,
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to
> you by mistake, please be nice and delete it, then tell me of my
mistake
> so I can send it to the right person.
>
>
>
>
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