Victor, Only you or your EE's can determine the required minimum electrical spacing and isolation needed for your product. However, from an assembly standpoint, lifted mask between two pads is an IPC-610 defect (Ref Rev D section 10.5.1.2) for all 3 classes, and furthermore is a real risk for wash media or other contaminants (service environment?) getting trapped and creating a nice conductive stew. Worst case is the board stops working. Kevin Glidden -----Original Message----- From: Victor Hernandez [mailto:[log in to unmask]] Sent: Tuesday, July 21, 2009 9:35 AM To: [log in to unmask] Subject: [TN] Solder mask undercut/over exposed Fellow TechNetters: What are worst case scenario when solder mask is undercut/over exposed to the point that it is floating and not touching the laminate between two adjacent lead on a DIP gull wing device. Victor, --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 -----------------------------------------------------