Sorry Bev, I am not quite sure which part of my post that you are referring to.
I did not mean to give you the impression that I would be implementing a
reactive dye in the future, but if you are referring to the fluorescent
yellow stain that results when the flux comes in contact with skin, the
flux containing that material has already passed all the aforementioned tests.
I did not get to see this email until today or else I would have been glad
to have discussed it with you in between sessions at Apex.
At 10:40 AM 2/17/2004 -0500, Bev Christian wrote:
>Phil,
>If you start talking about REACTIVE dyes, then as your mythical customer I
>would want to know if you were going to use it on real product and when
>would you be doing your copper mirror, halide ion, SIR and electrochemical
>migration testing?
>Bev Christian
>Research in Motion
>
>-----Original Message-----
>From: Phil Bavaro [mailto:[log in to unmask]]
>Sent: February 17, 2004 10:12 AM
>To: [log in to unmask]
>Subject: Re: [TN] fluorescing agents
>
>
>Tom,
>
>You have already gotten some great offers from the others but let me add a
>couple of things.
>
>It sounds like you are looking for a blue fluorescent indicator which is
>soluble in both your specific flux, paste, and cleaning solvent systems.
>
>When I first started implementing no clean in our factory, I discovered
>that the particular flux we had approved had a unique attribute to it that
>the manufacturer never publicized. If the liquid flux came into contact
>with human skin, it stained it fluorescent yellow/green. I tried to use
>the same quality to inspect flux coverage on pwbs but the flux looks dark
>brown on pwbs and components under a blacklight. The dye in the flux did
>however give me a great training aid for new operators and ensuring that
>they wore the proper protective gloves at all times.
>
>You already have some great offers from Rudy and Mike, but I will add one
>more source of a fluorescent raw material that I have used in the past.
>
>The company is http://www.pylamdyes.com/productFrames.html.
>
>If I knew more about what you are trying to test I might have made the
>recommendation that you find a dye that reacts with the residues left
>behind by the cleaning operation, rather than "mucking" with the rheology
>of the paste, or changing the composition of the fluxes, It gets pretty
>complicated otherwise because you have to be sure that the adulterant does
>not leach out of your residues, or perhaps causes your residues to resist
>the cleaning solvents.
>
>I will add something that I learned the hard way.... a little bit of dye
>goes a LONG way. I am still using the sample I got from Pylam when they
>were still locate on the east coast, and that was many years ago.
>
>It might be easier to make the residues turn dark brown by exposing the
>assembly to high enough heat if you are strictly looking for visual
>evidence of residues. Not to mention that trying to shine a black light
>under low standoff SMT parts is difficult in the first place, so some other
>method might be more prudent (like cutting the component off).
>
>Either way, have fun. (Oh, by the way, if you do happen to get the
>fluorescent material on your skin, it takes about 2-3 weeks before it goes
>away).
>
>
>Phil
>ax: 480-929-0078
>
>
>At 08:59 AM 2/16/2004 -0500, Tom Gervascio wrote:
> >Does anyone know of a liquid fluorescing agent that I can blend in with
> >some no -clean rosin fluxes and solder pastes? I'm trying to do some
> >qualitative cleaning tests under low standoff SMT components.
> >
> >Thanks
> >
> >Tom Gervascio
> >Senior Process Engineer
> >Sparton Electronics
> >(352) 540-4040
> >
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>Phillip A. Bavaro
>QUALCO/\/\/\/\ Incorporated
>CCA Technical Support
>Engineer, Senior
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Phil Bavaro
Qualcomm Incorporated
5775 Morehouse Drive
San Diego, CA 92121
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