Hey, take it easy.  Rudy is a rep, but he gives lots of GOOD, FREE advice. There is no
valid reason to be rude, we all know he sells for a living.  Take the chip off your
shoulder and limit yourself to helpful advice.

Chuck Brummer
I don't sell anything!

Rod Semen wrote:

> Hey Rudy,
>
> Next time buy an ad! If this is not thoses blatant advertising post, then I
> do not know what is. And by the way I have used your resist stripper.
> It sucked.....
>
> >From: Rudy Sedlak <[log in to unmask]>
> >Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, [log in to unmask]
> >To: [log in to unmask]
> >Subject: [TN] Tarnish after resist stripping
> >Date: Tue, 23 Nov 1999 09:37:28 EST
> >
> >I do love it when someone asks a question that we are real knowledgeable
> >on.
> >Thank you.
> >
> >Tarnish on Copper after stripping is endemic to resist stripping.  It is
> >made
> >much worse by buildup of Copper in the stripping chemistry.  In other
> >words,
> >most strippers will not tarnish when new, but begin to tarnish as they are
> >used, and Copper builds in the sump.
> >
> >The problem is cureable by using a  resist stripping chemistry with the
> >proper anti-tarnish in it.  Most resist stripping chemistry has 250 ppm of
> >Copper when the stripper is dumped.  It is possible to get resist strippers
> >that will not build up more than 30 ppm of Copper for the same number of
> >panels stripped, and average less than 2 false defects per 18" X 24" panel.
> >This has a nice added benefit of keeping the Copper in the rinse waters so
> >low that they usually do not have to be treated, and can legally be put
> >right
> >down the drain.
> >
> >Many stripper chemistry vendors have resolved this issue by simply going to
> >high volume feed and bleed, thus turning the sump over often, and keeping
> >the
> >dissolved Copper levels low.  This is great for the chemistry vendor, but
> >expensive for the PCB fabricator, and not required with the proper
> >anti-tarnish chemistry.
> >
> >As you probably have surmised, we are one of the vendors who can supply
> >resist strippers with the proper anti-tarnish properties.
> >
> >Rudy Sedlak
> >RD Chemical Company
> >[log in to unmask]
> >
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