But the sun don't shine there! -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory Sent: Wednesday, March 22, 2006 3:48 PM To: [log in to unmask] Subject: Re: [TN] chromates on copper surface (Cr6), Where? msg2 Caps Lock mean that I would tell you where you might find some, but you wouldn't like it. Jason Gregory Manufacturing Engineer Innova Electronics (281)653-5593 (281)653-5594 fax (281)594-0602 cell [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez Sent: Wednesday, March 22, 2006 3:41 PM To: [log in to unmask] Subject: Re: [TN] chromates on copper surface (Cr6), Where? msg2 Where can the INDICATOR be ACQUIRED???? Victor, -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75) Sent: Wednesday, March 22, 2006 3:14 PM To: [log in to unmask] Subject: Re: [TN] chromates on copper surface (Cr6), Where? msg2 I thought it would be more raven in the presence of a crow mate. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Barmuta, Mike Sent: Wednesday, March 22, 2006 2:06 PM To: [log in to unmask] Subject: Re: [TN] chromates on copper surface (Cr6), Where? Rudy: It goes to a brilliant violet color in the presence of chromate. Mike B. Fluke Corp. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak Sent: Wednesday, March 22, 2006 11:24 AM To: [log in to unmask] Subject: Re: [TN] chromates on copper surface (Cr6), Where? Mike Barmuta reported the name... Use it this way... put a drop of dilute Hydrochloric acid on part to be tested.... wait a couple of minutes, put a drop of indicator (1% in deionized water)... I cannot recall color change, but if chromate present, color changes... run a known to be sure. If you cross section a panel, and run this test, it does not necessarily mean the panel has no chromate, it can mean that the chromate is not accessible to the Hydrochloric acid...only a test on bare foil is conclusive. Rudy Sedlak RD Chemical Company "Victor G. Hernandez" <[log in to unmask]> wrote: I would be interested in the name of the Cr 6 indicator. Victor -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak Sent: Wednesday, March 22, 2006 12:23 PM To: [log in to unmask] Subject: [TN] chromates on copper surface (Cr6), Where? All: I suspect much confusion in this discussion is coming from the fact that we are not identifying which side of the foil we are talking about. I believe that, at least at one time, both sides had chromate (Cr +6) conversion coatings... it is quite true that the top side, away from the laminate, gets washed clean of any/all chromates, and thus is compliant. However, I suspect strongly that the side of the foil that is attached to the laminate has a high loading of chromate, and it is not removed by any processing the panel goes through. We could get into discussion of whether this chromate ever gets into the environment, but frankly, sadly, it would not matter, this is a legal/political issue, and the real world has no bearing on the issue. Also, there is a colorimetric indicator, which is highly sensitive, which will indicate presence of Cr +6 (ONLY!). I can find the name, if anyone is interested. Rudy Sedlak RD Chemical Company --------------------------------- Yahoo! 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