Bogert

As a basic follow-up to Brians posting - get the stuff off, it will corrode.
No, do NOT put the assemblies into an ionic cleanliness tester, you will
contaminate the machine a damage the filter unnecessarily.

You should ideally, strip the coating completely, re-clean the assembly to
ensure thorough removal, cleanliness test and re-coat.

Exposing a coated assembly to a cleaning and/or cleanliness test stage, will
probably compromise the coatings long term protective performance.

Due to these "difficult" re-work issues, most military users (and others)
prefer to use Acrylics. They offer broader performance/process benefits -
even compared to paraxylylene to which your previous posting referenced.

Hope this helps
Regards, Graham Naisbitt

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  -----Original Message-----
  From: TechNet [mailto:[log in to unmask]]On Behalf Of Bogert
  Sent: Tuesday, September 04, 2001 11:15
  To: [log in to unmask]
  Subject: [TN] Use of Omegameter for Cleanliness Testing of PWAs that have
been Conformal Coated


  9/4/2001
  My question is, would an Omegameter 600 ionic tester, or equivalent,
identify the presence of conductive conformal coating removal gel after Type
UR conformal coating was re-applied after rework to remove coating using the
conductive stripper (the stripper was manufactured by, and recommended by,
the Type UR conformal coating manufacturer).  Obviously if the gel was
trapped under the re-applied conformal coating, the test would not detect
its presence.  However, if the test was performed prior to re-applying the
conformal coating, would it yield any results that would be useful?  Also,
what impact would the alcohol in the test solution have on the Type UR
coating.