Originally we thought they were silver. They are Immersion White Tin.
We've decided to scrap the whole lot.

-Al Onderick

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, May 04, 2005 3:34 AM
To: [log in to unmask]
Subject: Re: [TN] Via contamination

Are these boards Immersion Tin? We had a similar problem with some Tin
PCB's
where the Tin chemistry was being left behind in the tented vias and then
erupting during reflow. Check with PCB supplier.

Mark

===== Original Message from [log in to unmask] (TechNet E-Mail Forum) at
3/05/05 16:40
>Greetings Tech netters,
>
>
>
>            In the past we've had problems with tented vias not
completely
>tenting and trapping liquid.  The liquid would boil and find its way to
>the surface of the board.
>
>
>
>While this looks similar these vias were not tented.
>
>
>
>
>
>http://www.texas-gold.org/PCB/
>
>
>
>Al Onderick
>
>National Instruments
>
>
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