Hi,

We do use DI water in the rinse.

We use AAT Corp Emulsonator 9700.  It has the feature of monitoring the
rinse cycle's resistivity, and comparing that to a predetermined value.
When the resistivity reaches the predetermined value the rinse stops (if
the time has expired).

Thus I am not sure what to enter for the predetermined rinse restivity
value. Does anyone have a similar machine?  We use an RMA type flux.

Thanks in advance for any help,
Jason


>>> [log in to unmask] 04/15/03 04:31PM >>>
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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