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November 2000

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Sender:
TechNet <[log in to unmask]>
X-To:
"Marsico, James" <[log in to unmask]>
Date:
Mon, 6 Nov 2000 09:05:20 -0600
Reply-To:
"TechNet E-Mail Forum." <[log in to unmask]>, Franklin D Asbell <[log in to unmask]>
Subject:
Re: Board White Tin finish
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From:
Franklin D Asbell <[log in to unmask]>
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We've observed what could be described as 'whisker's' on one lot some
time ago...after evaluation we determined it to be caused by inadequate
cleaning prior to the immersion bath. We really are not concerned about
whiskers.

A big difference is in the grain structure which is very uniform and
closely bonded in comparison to 'plain old tin' plating which has a
loose, course grain structure...what this leads to is a flat surface
that does not attract or retain contaminates like the 'old' tin baths...

Franklin

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