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June 2005

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Subject:
From:
Kaye Clayo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kaye Clayo <[log in to unmask]>
Date:
Mon, 13 Jun 2005 12:33:36 -0400
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Why would open (assuming you mean unplugged) immersion silver vias
increase assembly problems and cost more money?
Should immersion silver vias be plugged as a standard all the time?

Kaye Clayo
Keithley Instruments, Inc.

At 11:39 AM 6/11/2005, you wrote:
>We have been manufacturing boards with immersion silver for 8 years, six
>of those we have supplied plugged vias.
>The process works best BEFORE the immersion silver process.  It should not
>be done after immersion silver because of the possibility of contaminating
>the silver.
>There NEVER should be anything in the via holes that could etch the hole
>walls.  They must have a very marginal via plugging process.  Best pick
>another fabricator until they improve their via plugging.  Open vias could
>increase assembly problems and cost you more money.
>
>Happy Holden
>Westwood Associates
>
>
>
>
>Kanaiyalal Patel <[log in to unmask]>
>Sent by: TechNet <[log in to unmask]>
>06/10/2005 05:23 PM
>Please respond to
>TechNet E-Mail Forum <[log in to unmask]>; Please respond to
>Kanaiyalal Patel <[log in to unmask]>
>
>
>To
>[log in to unmask]
>cc
>
>Subject
>[TN] Immersion Silver - Via Plugging
>
>
>
>
>
>
>Our supplier is recommending against plugging via holes the immersion
>silver boards and here is their explanation. Need some input into how you
>guys are managing.
>
>"We can not plug before silver because chemicals used during the silver
>process may become trapped. Over time these chemicals can eat away at the
>hole wall copper creating voids.
>2. Because the boards have passed through rout and are in piece form when
>silver is applied the board can not be plugged in panel form as are the
>gold boards.
>3. Immersion silver is soft and easily damaged. It is our last
>manufacturing process and we avoid handling it as much as possible after
>being coated, this particularly applies for the plug process."
>
>Appreciate your feedback.
>re,
>Hemant
>
>
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