=============================== Jim Maguire Senior Principal Engineer Boeing Defense & Space Group (206)657-9063 fax 657-8903 Email: [log in to unmask] ================================ >---------- >From: Chang, Willy >Sent: Friday, March 07, 1997 10:13 AM >To: Maguire, James F >Subject: RE: Conformal coating > >Our experience at Boeing reaffirms that the conformal coating material will >wick onto pins of unsealed connector. Nevertheless I would still recommend >coating metal surfaces especially if it is going to be exposed to humidity >and salt/fog testing. Albeit conformal coating is not a hermetic seal but >our testing shows it does make a noticeable difference. > >We occasionally encounter designs that uses unsealed connectors. In those >incidences, we pot/seal the backs of the connector (e.g., polysulfide, etc.) >prior to coating which prevents wicking very effectively. Of course the >"mouth" of the connector is sealed w/liquid maskant and adhesive tape. We >have also found wicking is much less of a problem when using spray as oppose >to immersion application. > > > >================ >Willy Chang >Electronics M&P >Org. 9-5572 >657-9194 > >---------- >From: Sheila Smith[SMTP:[log in to unmask]] >Sent: Friday, March 07, 1997 5:16 AM >To: [log in to unmask] >Subject: FAB: Conformal coating > >Technetters: > >I am soliciting opinions on conformal coating of PBW-mounted connectors. >Our manufacturing folks refuse to conformal coat within 1/8" of any board >mount connectors. They contend the conformal coating will wick up the pins >and get on the contact areas, regardless of the type of conformal coating >used or the method of application. The connectors are not sealed. These >boards have to pass salt fog & humidity testing and I don't like the idea of >having bare areas, especially at the interface where the connector meets the >board. Does anyone have any experience with this? Thanks in advance for >your help! > >S. Smith, Tracor Aerospace Electronics Systems > >*************************************************************************** >* TechNet mail list is provided as a service by IPC using SmartList v3.05 * >*************************************************************************** >* To subscribe/unsubscribe send a message <to: [log in to unmask]> * >* with <subject: subscribe/unsubscribe> and no text in the body. * >*************************************************************************** >* If you are having a problem with the IPC TechNet forum please contact * >* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * >*************************************************************************** > > > > *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************