Hi All! I'm just wondering if I'm missing something. Is there any performance reason whatsoever, that requires solder mask over Tin/Lead instead of using SMOBC (Solder Mask Over Bare Copper)? Got a board in receiving inspection that I got called back to look at because the mask was failing tape test. When I saw the board, it was solder mask over Tin/Lead, just like it was called out on the drawing. The mask had already lost adhesion in a few places, but we hadn't done anything to it yet assembly-wise... I see didn't see this particular boards drawing before we went out and bought it, otherwise I would have thrown-up a red flag then. What suprised me though, is that our fab vendor didn't say anything before they built it. Is anything other than SMOBC being used regularly. I thought solder mask over Tin/Lead was ancient stuff, and that everybody learned not to do that anymore... -Steve Gregory- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------