Leland,
What you request can and is being done by many of our customers -
automotive groups in particular.
However, as you learned from the other respondents, this is not a simple
exercise - but then what is?
To help, and without knowing your end application, I suggest that you
consider new SIR test methods as a "Process Characterisation" protocol.
The principal (but not unique) issues, relate to electro-chemical
reactions of an unpredictable nature. Viz: flux residues can harbour
unwanted ionic and non-ionic residues that may harm the circuit when it
subsequently exposed to humidity that can render them mobile - dendrites
/ intermetallic growths that commonly result in premature circuit
failure.
By taking representative coupons of your end assembly, and processing
them in sequence with your final product and exposing them to the same
process chemistries, you will be better able to determine the potential
reliability of your end product. What happens in production is usually
somewhat less controlled than tests done in the lab.
If you would like to see sight of a draft specification of this, let me
know off line, and I will attach the relevant stuff for your
consideration.
You might like to talk to some test labs: CSL - Pacific Labs - TRACE
Labs - Robisan and many others that you can trawl from the TechNet
archives. These folks can do the testing for you, and we can assist with
the test parameters...that differ considerably from the old and
out-of-date methods currently used to characterise process materials.
Regards Graham Naisbitt
[log in to unmask] <mailto:[log in to unmask]>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
> Sent: Wednesday, May 08, 2002 20:42
> To: [log in to unmask]
> Subject: [TN] Cleaning of No-clean Assemblies
>
>
> Folks,
>
> We've been asked to investigate the pros and cons of
> performing an aqueous wash of our no-clean assemblies prior
> to them receiving an acrylic conformal coating. Our
> management team wants the product to be absolutely free from
> any type of contamination.
>
> Has anyone had any experience with this? What are the
> possible advantages and some of the pitfalls we could anticipate?
>
> Are there any knowledge sources that you might be able to recommend?
>
> Any assistance would be sincerely appreciated.
>
> Regards,
>
> Leland Woodall
> Quality Coordinator
> Keihin Carolina System Technology, Inc.
> 4047 McNair Road
> Tarboro, NC 27886
>
> Phone: 252-212-1565, ext. 2865
>
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