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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 10 Sep 2010 07:52:05 -0500
Content-Type:
text/plain
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text/plain (196 lines)
Chris,

What is the 760G product?   Dielectric grease!

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris BALL
Sent: Friday, September 10, 2010 7:48 AM
To: [log in to unmask]
Subject: Re: [TN] humid environments and long term reliability

" I have several HP calculators that used to be intermittant (battery
contacts) until I took a q-tip and applied 760G on them.  Also several
flashlights and the trailer hitch on my Volvo wagon."

...must be one hell of a q-tip....

:-)
Chris



On Sat, Aug 28, 2010 at 1:31 PM, Bob Landman <[log in to unmask]>wrote:

> Carl,
>
> We had a problem years ago with Molex/Amp tin-plated power connectors
> (0.156" spacing).  We traced the problem to corrosion (we could see the
> discoloration on the pins caused by the humid enviroment + airborne
> contaminants).  We contacted Molex who recommended Nye Lubricants Nyogel
> 760G connector lubricant.
>
> At the time I happened to be visiting Henning Leidecker and Jay Brusse at
> NASA Goddard Space Flight Center so asked them for advice. I  was advised to
> read the following paper.
>
> http://www.agingaircraftconference.org/all_files/20/20c/123_doc.pdf
>
> That convinced us we were on the right track (we had been concerned it was
> a circuit design or component problem as the falures were random).
>
> We sent the client a tube of 760G which he applied to over 200 of our units
> in 2007.  The problem (intermittant power failure) vanished.
> www.nyelubricants.com   We now apply 760G to all our tin-plated
> connectors.  Also some gold plated connectors (RJ-45 type) as we found in
> some environments (like sewage treatment plants) the atmosphere quickly
> finds and corrodes the tiny pinholes in the gold flash coating.  Unless the
> mfg plates a very thick gold coating, you can expect such imperfections to
> corrode.  The result is a greenish tarnish which is an insulator.  I have
> several HP calculators that used to be intermittant (battery contacts) until
> I took a q-tip and applied 760G on them.  Also several flashlights and the
> trailer hitch on my Volvo wagon.
>
> Regards,
>
> Bob Landman
> H&L Instruments, LLC
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer
> Sent: Monday, August 23, 2010 1:53 PM
> 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]
>
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