Hi All - The old mail system gobbled this one up and kinda spit it back in pieces, so I don't know if any of all of it got distributed earlier, but will try again - Kelly Mornin' Steve & All - IPC-SM-840C, para. 3.3.3, titled Solder Mask/Production Board Process Qualification Assessment spells out a set of tests that are to be performed by the board fab house and/or user. Included in this is "Resistance to Assembly Process and Chemistry" which requires the mask be tested by processing in the appropriate flux and cleaner specified in the procurement document. Having been burnt by this item more than once, I guess you can tell I'm more than a bit sensitive to the issue. In our case, we've tested a number of masks thru our internal processes and impose that listing on our board suppliers to limit the specific solder masks coming in. Steve, as Steve Mikell noted, you've hit about the same combination that we got stung by at one time. Darned if I know another way to solve the issue, other than limiting the masks to those you've tested and know to be compatible with your internal processes. I'm leery of just asking the fab house to test the specific solvents, because they have no way of knowing how many cleaning cycles, duration, spray pressures, etc. Y'all have a good weekend 'n holiday. By the bye, since this is Friday, should we also declare it another "STEVE DAY"? Regards - Kelly ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################