See below:

----- Original Message -----
From: "Matt Polak" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Wednesday, October 02, 2002 2:52 PM
Subject: Re: [PEDA] LPI oxides? ( OT - Good places to get boards populated)

[snip]

>          One thing I have seen from AC, though, that I've not seen from
> anyone else is an oxide finish that they apply under the LPI mask to make
> it adhere to the copper better. This results in traces on the outer layers
> showing up in 'black' rather than 'shiny green' like everyone else's
> boards. It does kind of look cool, but I've never seen this outside of
AC's
> boards. Talking to the head CAM guy there yielded the specific
explanation:
>
>          "That is actually an oxide finish to promote soldermask
> adhesion.  We may be
> phasing it out shortly, however, so don't be alarmed if you stop seeing
it."
>
>          Out of curiosity, has anyone else ever seen this done before?
>
> -- Matt
>

I kind of like how it looks too.

Actually, my understanding is the black oxide is a by-product of a few
of the many alternative fabrication processes.  It doesn't harm anything.
Of course, I could be completely wrong and the AC guy is totally correct

Jeff Stout

[snip]


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