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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 15 Apr 2003 14:31:40 -0500 |
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Jason,
I would recommend that you use deionized water in your cleaning for the
same reason that soft water is better for cleaning clothes. DI water is a
hungrier solvent. I would recommend using 2 megohm-cm resistivity water
(0.5 uS/cm conductivity) as a minimum. When you get below 2 megohm, you
get in RO purity water, better than tap water, but not as good a cleaner.
I also recommend 140-150F for temperature.
A 10 minute rinse is about normal.
Doug Pauls
Rockwell Collins
Jason Wilson
<wilson.jason@NORTHROP To: [log in to unmask]
GRUMMAN.CA> cc:
Sent by: TechNet Subject: [TN] Cleaning Question - Rinse water resistivity?
<[log in to unmask]>
04/15/2003 01:39 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to Jason
Wilson
Hi Everyone,
I am a new member to the list and I have a question on cleaning. Thanks in
advance for any help you can provide. It is much appreciated.
What should the value be for rinse water resistivity? The cleaner we have
is a AAT Corp Emulsonator 9700.
We use an RMA flux (both in wave solder, and in solder paste). The solvent
we use is EC7R.
Also, we currently rinse for 10 min (+ time to reach resistivity). Does
this seem low? We are having trouble with board cleanliness.
Once again, thanks for any help provided.
Jason
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