Franklin: There are saponifiers, and there are SAPONIFIERS.... Similarly, there are soldermask, and there are SOLDERMASKS, More, there are different ways of applying and baking soldermask... We are going through some trials right now, looking at the effect of a cleaner we just developed which has some effect on some soldermasks, and the results we see from our tests show vast differences in attack, from no noticeable attack, to total removal/stripping of the mask. At the end of the day, a saponifier (by definition) is a source of alkali, and most soldermasks are alkali developed, which means they are at some level susceptible to attack by alkali. You get the right soldermask and the right saponifier together, and they will dance each other right off the board.. Rudy Sedlak --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------