Opps, not talking solder mask but silk screen. IPC-A-610 markings, Clause 8.2 Screened Markings shall not interfere with soldering requirements of section 12. Even if your design guys blew it ( IPC 2221 clause 4.6 warns designers not to put markings so close to lands as to impair solderability), the board house should have contacted the user and requested disposition, before proceeding with marking. I would add another caution. Screened marks can act as shims under the stencil. The marks can vary in height. This can cause variation in solder paste deposition that can produce variation in process performance. It can easily be enough to introduce squeeze balls and tombstones. You will see board to board and lot to lot variation. Not good. Keep the marks away from the land patterns. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of West, Jim Sent: Wednesday, September 24, 2003 3:33 PM To: [log in to unmask] Subject: [TN] Silkscreen in solder pad Hi, Is there a IPC standard for how much, if any silkscreen can overlap a solder pad? What process is recommended for cleaning a solder pad with silkscreen overtop of it? Examples I have are silkscreen on 0805 pads halfway through it, and some with silkscreen just barely touching. Thanks, Jim --------------------------------------------------- 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------