Mark, I was just reviewing the IPC-SM-840 standard, and came across section 3.4.7, "Visual Requirements". This section gives requirements for allowance of surface imperfections for solder mask. (Touch-up is certainly allowed...) Table 2 gives the "Maximum Number of Allowable Imperfections" for each class. Class 2 is 3 imperfections per 6.5cm2 (1 sq.in., and Class 3 is 1 imperfection per 6.5 cm2 (1 sq.in.). (It must be Monday... where did my weekend go?!?) Best Regards, Roger M. Stoops Trimble Navigation Ltd. --------------------------------------------------- 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 -----------------------------------------------------