Rod,
Bashing Rudy is accomplishing nothing!
Rudy has been a long time contributor to this forum and many of us on the
TechNet enjoy hearing what he has to say. His contributions in the past
have done more advertising for him and his company than that little blurb at
the end of this post.
Rudy has helped out a number of people and has shown more than once that he
is a knowledgeable chemist.
By the way...I've never seen you post before. Go figure.
Scott M. Severson
Benchmark Electronics Inc. - Winona
-----Original Message-----
From: Rod Semen [mailto:[log in to unmask]]
Sent: Tuesday, November 23, 1999 9:38 AM
To: [log in to unmask]
Subject: Re: [TN] Tarnish after resist stripping
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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