Les,
I was speaking to the flux portion alone. Going no-clean involves much
more than just a selection of a low solids flux. When you go no-clean, you
have to be paranoid about bare board cleanliness, component cleanliness,
handling residues, random schmutz, etc. All of which can kill your product
if you don't understand it and control it. The early days of conversion to
no-clean had hundreds of horror stories, some of which can be found today.
Many low solids fluxes are designed to not be cleaned, which makes them
very tenacious residues and hard to remove fully. Low solids fluxes that
are designed with possible cleaning in mind are more easily and fully
cleaned. Like many low solids fluxes, leave them alone, fine. Fully clean
them, fine. Do a partial cleaning, big problems. You remove the benign
part and unleash what remains. There is lots of test data in IPC papers,
some of which I wrote.
I'd write more, but I have to catch a plane. Sure hope it's not
lead-free..............
Doug Pauls
"- Bogert"
<[log in to unmask]>
To
11/06/2006 05:13 "TechNet E-Mail Forum"
PM <[log in to unmask]>,
<[log in to unmask]>
cc
Subject
Re: [TN] Cleaning media for no
clean paste
November 6, 2006
If you do not clean after soldering using any type of flux, including the
no-clean, how do you know there may not be some other form of contamination
present that is unrelated to the flux use; for example residue from the PWB
processing, handling of the PWA, residue from component leads, etc. Is it
not possible these could cause equipment operating problems, etc. Also,
what is the problem cleaning PWAs that have no-clean flux? Are you saying
that cleaning a no-clean flux will activate what may have been a benign
flux? If so, is there test data available that suupports this?
----- Original Message -----
From: Douglas O. Pauls
To: [log in to unmask]
Sent: Monday, November 06, 2006 11:26 AM
Subject: Re: [TN] Cleaning media for no clean paste
I would agree with Steve. The Aquanox line has served us well at Rockwell
and we are converting over to the Kyzen Aquanox A4520 and are getting
excellent resuls. I am a proponent of aqueous cleaning since you get both
the dynamic action of pressurized spray, the thermal activity of hot wash
and rinse waters, and the chemical energy of a saponifier. For these
reasons, I would strongly recommend you stay away from any kind of vapor
degreasing and no-clean residues. Bad Karma.
I guess the more important question is why are you cleaning the low solids
flux residues and is the low residue paste designed to be cleanable? Very
important questions.
Doug Pauls
Rockwell Collins
Steve Gregory
<SGregory@OAIELEC
TRONICS.COM> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
11/06/2006 10:05 Re: [TN] Cleaning media for no
AM clean paste
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
Steve Gregory
<SGregory@OAIELEC
TRONICS.COM>
Hi Dan!
I've always had very good results cleaning no-clean residues with Kyzen
Aquanox 4512P in a batch cleaner. They have another formula for
lead-free residues, Aquanox 4630. They also have another formula
(Aquanox 4520) that I've not had a chance to use, that is supposed to be
better than the 4512P. You might want to give them a call...
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Mauro
Sent: Monday, November 06, 2006 9:56 AM
To: [log in to unmask]
Subject: [TN] Cleaning media for no clean paste
Folks,
I need to clean the residual residue left if any on boards processed
with no clean paste.
What should one use. Any thoughts - is there a common chemical cleaner
that can penetrate under components.
Thanks in Advance
Dan
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