You're welcome.

Actually, your question brings to mind another question that I will ask the
forum.  One of my young colleagues at a different facility wants to become
more educated on fluxes for electronic manufacturing and wanted to know if
there were any classes or courses that were offered anywhere on the topic.

I don't know of any off the top of my head.  I don't know if there have
been any IPC professional development workshops on the topic.  Does anyone
know of formal classes on fluxes or flux chemistry that is offered in the
industry?

*Douglas Pauls *| Principal Materials and Process Engr | Advanced
Operations Engineering

*COLLINS AEROSPACE*

400 Collins Road NE, MS 108-101, Cedar Rapids, IA  52498  USA

*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773

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On Thu, Feb 27, 2020 at 3:09 PM Jenkins, Jeffrey (US) <
[log in to unmask]> wrote:

> Doug and Richard,
>
> Thank you both very much I do appreciate both of your assistance.
> Something in the back of my mind (probably from IPC Cleanliness
> conferences!) said it’s not the best thing to do.  I also went and pulled
> the IPC-CH-65 Paul had mentioned prior and I look forward to reading it.
>
> Best,
>
> -Jeffrey
>
>
> From: Douglas Pauls <[log in to unmask]>
> Sent: Thursday, February 27, 2020 12:55 PM
> To: TechNet E-Mail Forum <[log in to unmask]>; Jenkins, Jeffrey (US) <
> [log in to unmask]>
> Subject: Re: [External] [TN] No-Clean (ROL0) question....
>
> CAUTION: Email originated from outside of Cubic.
>
> Jeffrey,
> I will send you a document that I drew up about 12 years ago, together
> with the late Dr. Bill Kenyon.  It talks about no-clean fluxes and why
> someone would choose to clean a no-clean flux.  You might find it of
> benefit.
>
> There are also a number of excellent papers by Dr. Mike Bixenman of Kyzen
> on the nature of fluxes under QFNs that more addresses what can happen if
> those low solids residues do not get to the proper temperature.
>
> Douglas Pauls | Principal Materials and Process Engr | Advanced Operations
> Engineering
> COLLINS AEROSPACE
> 400 Collins Road NE, MS 108-101, Cedar Rapids, IA  52498  USA
> Tel: +1 319 295 2109 | Mobile: +1 319 431 3773
> [log in to unmask]<
> https://urldefense.com/v3/__http:/collins.com__;!!Ooxr18I!SpjguiMwPUXmAyuL-TOQ6oNFndlaWAj2leYz1JtaVdafwZmwGo_HqZ-Xr1tX1Ea26VMJ$
> >
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>
> On Thu, Feb 27, 2020 at 2:21 PM Jenkins, Jeffrey (US) <
> [log in to unmask]<mailto:[log in to unmask]>> wrote:
> Fellow TechNetters,
>
> I apologize if this may seem like a newbie question and if so I apologize.
> I've used OR fluxes and RO fluxes and have always had them removed by the
> cleaning process as most of the products that I work on have an expected
> life of 10+ years.  We've typically validated the amount of WOA and
> Chlorides and set baselines for those.
>
> Someone posed me a question about cleaning no-cleans. Even though in a
> perfect world a no-clean flux should be 100% inactive after reflow, I'm
> betting that's never perfectly the case.   So my view and response was that
> based on the life span and end use environment, my concern would be
> humidity/moisture mixing with the residual material and in the long term
> increasing the risk of dendritic growth and other things.  Am I off the
> mark?
>
> Thanks,
>
> Jeffrey A. Jenkins, CID+
> Principal Engineering Designer
> Cubic Mission Solutions
>
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