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ENGINEERING RELIABILITY
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On 21 Jun 2006, at 17:16, Bloomquist, Ken wrote:

> We are seeing something that we've never noticed before and
> wondering if
> any of you have seen it and figured out a cure.
>
> We are hand spray Type UR coating. The boards are very well cleaned
> and
> dried prior to coating. What we are seeing is a lack of coating on top
> of via's. It's most prevalent on small via's, .013" but we're
> seeing it
> on some of the larger ones as well. When we black light the board you
> can see black spots on top of the solder in the via.
>
> It's not just a thin coating but an actual void area. It's exactly on
> the dome of the solder of the via. Our nominal coating thickness is
> around .003".
>
> I sure would appreciate any help on finding a cure for this!
>
> Thanks,
>
> KennyB
>
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