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June 1999

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Subject:
From:
"Vandendolder, Ron" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum." <[log in to unmask]>, "Vandendolder, Ron" <[log in to unmask]>
Date:
Tue, 8 Jun 1999 09:12:46 -0400
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As an OEM of radio transceivers, we specify a product called "Omikron
Immersion White tin" as a solderability protective coating on our circuit
boards.  60-80 microns works well for us in terms of shelf life and the
coating does not have the issues of whisker formation associated with
commercial gray tin. However,if the board sits around too long at higher
temperatures, the CuSn inter-metallic grows in thickness at the expense of
the solderable tin rich surface.  The chemistry manufacturer has a tech
sheet on the time/temp profile. (970-346-8002).


Ron VandenDolder
Manager, Manufacturing
Millitech Corp
[log in to unmask]



-----Original Message-----
From: Neil Atkinson [mailto:[log in to unmask]]
Sent: Tuesday, June 08, 1999 3:07 AM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver


With reference to some of the comments made on immersion silvers (not
mentioning any trade names).

Our experience with these finishes has been that they 'tarnish' very quickly
in open air and although all PCBs should be handled carefully, stored /
packaged correctly etc.  HASL is certainly much more forgiving than the
immersion silvers in our experience.

The immersion tins which are currently on the market look much more
promising and initial tests we have carried out on Unicrom (manufactured by
cimatec have looked hopeful but I would be interested to hear of any other
experiences with immersion silvers / tins.



Neil Atkinson
Quality Manager
Stadium Electronic Controls

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