Jerry, Refer to specification IPC-SM-840, Qualification & Performance of permanent Solder Mask. This has a specific section on visual & physical requirements and adhesion. Thanks Tony Cosentino Tekelec - PCB Engineer [log in to unmask] -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Wednesday, July 13, 2005 6:33 PM To: [log in to unmask] Subject: [DC] Hi I have an engineer who is concerned about uniform thickness of solder mask over pad (sharp and well-defined edge), and good adhesion of the solder mask material to the pad (so solder won't undercut it), and removal of residues. This is in the 1mm BGA pad using a dog bone breakout. So what I was wondering is what IPC doc would give me some information and if any of you have any info. Thanks Jerry Johnson PC Design Process and Tools Engineer Agilent Technologies, Inc 1900 Garden of the Gods Road Telephone: 719-590-2231 Colorado Springs, CO Email: [log in to unmask] ------------------------------------------------------------------------ --------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------