We use Axarel and have seen problems when it gets into cavities and
doesn't get adequately rinsed and dried.  Potentiometers and switches
are particularly problematic.   I don't know all your applications but
failures could be induced by the conductivity of the solution as well as
chemical attack..  Label adhesives are attacked quite effectively by
Axarel as is the adhesive used on mylar insulating tape.  I am
particularly curious about the effect on dielectric strength on magnet
wire insulation since transformers carry a strong Axarel odor long after
they are cleaned and dried.   I just haven't gotten around to testing
for an effect yet.  Ionic contamination from this remaining Axarel has
not been a problem but we have not done SIR testing for organics.  I
would suggest a latex masking plug over the hole in the oscillator case.
  As a side note, I have tested for cleaning solution absorbtion by AlO2
electrolytic capactors through plain and epoxy end seals by means of
weight measurements and have found nothing to indicate that anything
leaks in.
 ----------
From: Rajan, Sanjay
To: technet
Subject: Unidentified subject!
Date: Tuesday, November 19, 1996 10:22AM


Technetters,

This is a specific question about the impact of the cleaning
solutions ProClean (alcohol?) and Axarel (semi-aqueous)
on components.  In particular, we have a crystal oscillator
in a package with a hole through which the frequency of the
oscillator can be tweaked (trimming capacitor).
We are seeing some failures and I am wondering if any of it
is due to any of the above
cleaning solutions entering the components.

1. What is the normal force with which cleaning solutions clean
    boards (does 20 psi sound reasonable)?
2. Has anyone out there seen failures due to this?
3. What is the composition of the semi-aqueous cleaners like Axarel?

Thank you

________________________________________________
Sanjay Rajan        RF Communications Division
Harris Corporation  Product Design Engineering
1680 University Avenue   Phone:    (716) 242-3923
Rochester, NY 14610 Fax: (716) 242-3174
________________________________________________

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