Hi,

 Another items to consider is how well and forced air water blow off knives work. 

If you weigh a board before and after wash you can determine how much water remains. And knowing the water ionic content (or anything else) will show remaining water can contribute little to board ionic content. You can wash in straight city water with a good blow off.

Bob K.


-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Richard Kraszewski
Sent: Wednesday, February 26, 2020 11:29 AM
To: [log in to unmask]
Subject: Re: [TN] Cleaning Course of Study

My thoughts include that you should consider:
1.      How to run DOE's and GR&R (or assume they come in with a back ground).
2.      How to run failure analysis  with multiple examples which include  techniques used and (why not used) as well as the thought process.
3.      Horror& risks of manual cleaning.
4.      Chemistry interactions with labels, ink markings
5.      Listing & review of useful IPC  (and other industry) specifications
6.      FOD - issues with identification, risk, control, etc.
7.      FTIR usefulness and complications.   (like statistics- you can almost never say you are certain - especially with unknown "crud").
8.      How clean does DI water really need to be
9.      Thoughts on steam cleaning
10.     When (if ever)  can you leave a residue on a PCA ( coating of residues).
11.     Lots of nasty looking failure pictures to scare the "bah-gee-bees" out of them

Rich  Kraszewski
Senior Staff Process Engineer

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, February 26, 2020 6:43 AM
To: [log in to unmask]
Subject: [TN] Cleaning Course of Study

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Good morning Technetians

OK, so I have been thinking (and we know how dangerous that is) about developing a course of study for someone to become a "cleaning expert".
Something along the lines of starting with a new hire and educating the new hires up to my level. Courses would include things like flux chemistry, cleaning processes and chemistry, cleanliness measurement methods, SIR methods, etc.  What items would you suggest be added to the course of study?

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

*COLLINS AEROSPACE*

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