The main reason for Sodium Chloride limits on a board is to
prevent dendrites forming between two points and creating a damaging
short. As stated below, there is a latent risk if there is salt in the
vicinity of a PWA. Now if the chances are very low that this salt will
travel, or the board is coated and the board is going to be used in the
desert(low humidity), then I would not worry too much about it.
One man's opinion.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Monday, February 20, 2006 1:11 PM
To: [log in to unmask]
Subject: Re: [TN] NaCl Contamination levels on Plated Metal Parts

Hi Andrew

This would not apply to metal housings as described only to the
electronic circuit assembly.

Mark you, if there is yukky stuff on the metal housing and the housing
drips condensation onto the circuit assembly that might then contain
some of this yukky stuff...then you might have a problem.

Hope it helps

Graham Naisbitt


On 20/2/06 18:00, "Joseph H. Smith" <[log in to unmask]> wrote:

> Fellow technetters,
>
> I realize that there is an expected specification levels for the NaCl 
> contamination of PCB's.  Pardon me if I may be asking a dumb question,

> but does plated metal such as housings and the like be under the same
> specification limits for NaCl?   Are there guidelines or documentation
within
> the industry which state this value?  These are metals that may come 
> in close proximity to the PCB but necessarily mounted on the PCB.
>
> Andrew Kettlewell
> Sr Process Engineer
> Sypris Electronics
> Tampa, Fl
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