Joe,
    you can try Sheldahl, they use these chemicals.

phone: 507-663-8000

http://www.sheldahl.com

Regards, Mauricio Castro


On         Thu, 23 Sep 1999 15:30:58 -0500, Joseph T Slanina wrote:

> I need to obtain information and vendor contacts on antitarnish materials
> used for current flexible and rigid PWB processing in outside industry.
> Some of the information I need is:
>
> 1) What are the antitarnish chemicals currently used and what are their
> chemical compositions?
>
> 2) How, when, and where in the PWB fabrication processing are the
> antitarnish materials applied? I need information especially for flexible
> circuit processing (print & etch, plated).
>
> 3) What are the major problems associated with using antitarnish
materials?
> (solderability issues,...)
>
> 4) Are antitarnish materials used in separate processing tanks or with
> rinse waters on conveyorized equipment? If so, how?
>
> We are experiencing discoloration on copper clad flexible material
> currently cleaned prior to coverlay lamination in next assembly (Purple
> Plague).
>
> Any information and companies that I may contact on this subject would be
> greatly appreciated.
>
> Thanks,
>
> Joe Slanina
>
> 816-997-4012
>
>
>
>
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Mauricio Castro
011-523-668-1463
From USA 1-888-392-4832 x-523-668-1463




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