Just make sure that this blasting is made in a 50% humidity plus environment. Regards, Ramon > -----Original Message----- > From: Steve Gregory [SMTP:[log in to unmask]] > Sent: Monday, January 06, 2003 6:29 PM > To: [log in to unmask] > Subject: Re: [TN] Removal of Soldermask from assembled PCBAs > > Hi Frank! > > Whoa...you've got quite a task ahead of you! I've never been faced with > removing ALL the soldermask from the bottomside of an assembly. > > I can't think of any good way to use chemicals and restrict it to the > bottomside of the board... and the point about whatever chemical can take > off the mask is probably going to damage the laminate is true. > > I still think micro-blasting using Crystal Mark is the way to go. As far > as ESD issues, they use point ionizers at the tips of the nozzles to > eliminate ESD problems. In fact, they talk about that on their web page. > > I used them to remove some cured Loctite from the footprint of a QFP that > was mistakenly bonded to a board...the entire footprint was covered with > the cured adhesive (almost 2" X 2"). Getting the part off the board to be > able to remove the adhesive was fun, believe you me! > > The process removed the adhesive, and the mask as well...clean as a > whistle. We used some SR1000 to re-apply the mask when we got the assembly > back. They can select the abrasive material that will remove the mask, but > won't touch the copper. > > I'd give them a call, they may be able to turn things quickly for you. > > Good Luck! > > -Steve Gregory- > --------------------------------------------------- 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 > ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------