Mr. Ross, I don't have any data on the surface tension requirements for optimal comformal coating compatibility. For this, I would suggest that you contact Conap, Humiseal, Dow Corning or another conformal coating manufacturer. We have found that the method of application has a big impact on the compatibility of the conformal coating and the solder mask. A coating that properly wets a surface when it is applied by dipping may exhibit dewetting when it is thinned and sprayed. The altered surface tension of the solvent/coating mix is probably a key factor. In addition, the mask cure conditions, the soldering conditions, the flux (and its residues) and the post clean process may affect the conformal coating compatibility. Sorry I can't be of more help. Regards, Curt Lustig Associate Scientist Solder Mask R&D Group Morton Electronic Materials (714) 730-4511 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * 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] * ***************************************************************************