IPC SM 840 C states; "When conformal coating is to be applied in a subsequent operation, careful definition of adhesion requirements and the required test method(s) for that conformal coating to the production board system must be agreed upon by the printed board fabricator and his user customer (see IPC-CC-830)." We have found various conformal coatings perform differently with various solder masks. We have conducted in-house testing with the two solder mask products you mention. I would be happy to discuss our findings with you. Bob Metcalf Morton Electronic Materials 714-730-8356 >>> <[log in to unmask]> 02/02/97 06:03pm >>> Is anyone aware of compatibility guidelines for conformal coatings and solder masks? Specifically urethane coating on LPI mask. We are going to experiment with a Conap CE1164/1163 on Dynachem 200/200M. Apparently, the major contributing determinant is surface tension so I bought a kit to measure surface tension in force dynes. I just have to believe that some type of chart/guidelines has been created either emperically or on a scientific basis that assures good - excellent adhesion provided that the mask surface tension is "some what" higher than the coating. I also understand (heard) that this is not all that simple and that there are many other process variables affecting surface tension of each component. What all these variables are and how their variability influences surface tension is also part of my quest for a good solution. Any info on this would be greatly appreciated. Steve Ross 803-532-7679 *************************************************************************** * 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] * *************************************************************************** *************************************************************************** * 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] * ***************************************************************************