Rod,
Please refer to the following copy of the post sent by YOU on 8/28/99.
*************Date: Sat, 28 Aug 1999 12:18:06 PDT
*************Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,
************* Rod Semen <[log in to unmask]>
*************Sender: TechNet <[log in to unmask]>
*************From: Rod Semen <[log in to unmask]>
*************Subject: Re: Hey! Whatsa' matter with ya'll?
*************Content-Type: text/plain; format=flowed
*************I have been reading the recent ramblings. I read a lot, rarely post.
*************My conclusion is that some of you people must be a pathetic mess.
*************If you need someone to talk to, call your mother!
*************This is a forum for technical exchanges, not torque talk.GET A LIFE!!
You should make a practice of following your own advice.
In the future, if you do not like the content of a post, please either delete it or discuss alternatives (such as the posting by Richard (dba <[log in to unmask]>).
>>> Rod Semen <[log in to unmask]> 11/23/99 08:37AM >>>
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]
Eric Kalgren
BFGoodrich Aerospace
Data Systems Division
[log in to unmask]
(505) 938-5139
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