Technetters,
I want to thank Andrews, Brian and Doug for their feedback on wetting
agents. I would like to stir up just a little more discussion on this issue.
I have seen indications that for flux to be on a military qualified products
list (QPL), it should be halogen and polyglycol-free. Based on some
discussions I have reviewed, this could be because polyglycol, or "bad"
polyglycol, can lead to an increase in current leakage on assemblies.
However, has anyone come across experimental evidence that polyglycol, or
other wetting agents, can greatly accelerate corrosion of eutectic solder?
Trying to see if my testing is out of wack or if I'm measuring a real
mechanism.
Best Regards
Craig
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Friday, August 17, 2001 4:59 AM
To: [log in to unmask]
Subject: Re: [TN] Wetting Agents
Craig
There are many. However, I'd like to warn you against some of the
non-ionic polyethoxylates (heptyl-, octyl- nonyl- etc.), whether linear
or cyclic, especially as a component of water-soluble fluxes. These
biodegrade rapidly but form an extremely persistent series of virtually
unbiodegradable by-products which are highly toxic to aquatic life. The
sale of such surfactants is regulated in some countries but things like
fluxes which contain them are available.
Best regards,
Brian
Craig Hillman wrote:
>
> Hello Technetter,
>
> Quick question: What are some of the common chemicals used as wetting
> agents/surfactants in fluxes?
>
> Thanks for your help,
> Craig
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Furrow, Robert Gordon
> (Bob)
> Sent: Wednesday, August 15, 2001 2:31 PM
> To: [log in to unmask]
> Subject: [TN] FMA Labs in Northeast US
>
> Hi All,
>
> With the drastic reduction occurring here at Lucent, I am going to be
> without the services of our Evaluation / FMA Lab in Princeton for (at the
> very least) the period it takes to relocate it. At the worst, it could be
> shut down altogether. I am looking for another source to do the testing of
> PWB's and Backplanes for conformance to our specifications and reliability
> needs. This testing includes cross-sectioning with analysis, XRF, thermal
> shock, pull tests, solderability evaluation, SIR/EM, SEM/EDX, and also FMA
> of assembled boards. Ideally, I am looking for someone within driving
> distance so that I can easily foster the relationship. However, I am open
to
> any viable suggestions. If this is a testimonial from users please respond
> via the TechNet. If this is a lab promoting its capabilities, please
contact
> me directly at [log in to unmask] Thanks in advance for everyone's input.
>
> P.S. I am also looking for a lab to provide me the direction, insight,
> foresight, enthusiasm, and overall experience that George Wenger at our
> Princeton Lab has provided me.
>
> Thanks,
> Robert Furrow
> Printed Wiring Board Engineer
> Strategic Supply Global Account Manager
> Supply Chain Networks
> Lucent Technologies
> 978-960-3224 [log in to unmask]
>
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