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August 1998

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Subject:
Re: Selective Electroless Ni/Immersion Gold???
From:
Michael Carano <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 13 Aug 1998 22:55:47 -0700
Content-Type:
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James A. Zeman wrote:
>
> Is this possible?  I've heard that the temperature and Ph of the electroless
>  Ni bath tends to strip the dry film resist and has even been known to
> attack some solder masks.
>
> Does anyone have info or suggestions for a dry film resist that will hold up
> to this chemistry?
>
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> ################################################################James,
With respect to primary image dry film, the issue with attack is
difficult to avoid. Try contacting DuPont as I believe that they have
done a significant amount of work on this topic.

With respect to solder mask, you need to ask whether the mask is epoxy
based or acrylate based. The epoxy based masks stand up to the aggressive
nickel solutions much better than acrylate based masks.

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