Richard, as a solder mask manufacture, I have had considerable experience with conformal coatings, and adhesion issues to solder mask. The place to start, is contacting the solder mask supplier and determine if they suspect any comparability issues between the two coatings. We normally test all new solder masks with at least one representative of each conformal coating family, epoxy, urethane, etc. It isn't unusual to see some groups have less adhesion to a given solder mask. Another area of concern is application of the conformal coating. I have experience cases where the thickness of the conformal coating has caused adhesion failures. In many such cases, simply increasing the thickness of the conformal coating has eliminated the problem. Involve the manufacture of the conformal coating to insure it is being applied per their guidelines. If you need more help, give me a call Bob Metcalf Morton Electronic Materials 714-730-8356 >>> "Blanchet,Richard" <[log in to unmask]> 03/18/97 01:27pm >>> Hello, When encountering conformal coating to solder mask adhesion problems, I guess one of the usual place to look first is the cleanliness of the boards. But what if we don't have any problems applicating the acrylic coating (indicating that the board musn't be that dirty), the Omega test results are as usual (I know there can be some escapes) and, apparently, nothing seems wrong elsewhere ? Since I'm not that much experienced, I would appreciate any advice on adhesion of conformal coating and any reference to publications, past experience or else. Thank you. Richard Blanchet Manufacturing Engineer Canadian Marconi *************************************************************************** * 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] * ***************************************************************************