I don't mean to sound holier than thou, but I don't like partial depth drilling to cut traces and I don't advise filling a whole that is not the sum of its parts. If this part went into John Burke's Refrigerator, no one would care because the English like warm Beer anyway. However, if there is integrity required or long term reliability, I would do additional testing/cleaning of the hole before I applied a well engineered epoxy with a structured process. Things to consider are as follows: * Verify TCE compliancy with FR4 substrate * Verify ability to seal to prevent moisture/contamination ingression * Verify the by-products of the cure are not a potential contaminant * Verify the by-products of the cure are not potentially corrosive * Verify the by-products of the cure are not a growth medium * Verify the by-products of the cure are not conducive to forming an electrical migration path * Verify bullets 3 through 6 are still acceptable in the presence of humidity and a DC bias voltage * Verify that the adhesive and it's by-products do no outgas * Verify there are no amines in the formulation * Verify that the adhesive does not create any occupational hazards Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Tony Steinke Sent: Wednesday, August 15, 2007 2:28 PM To: [log in to unmask] Subject: Re: [TN] Drill Rework Kerry, A two part epoxy by 3M followed up with a 200F bake to fully cure should be fine. Tony Steinke -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerry McMullen Sent: Wednesday, August 15, 2007 2:28 PM To: [log in to unmask] Subject: [TN] Drill Rework Hi, I have a .062 FR406 board where I need to drill out a trace that is causing a problem. The trace is .020" down in the board (Layer 4). The drill size is .012. After I have drilled out (opened) the trace, what do you suggest I fill the drill hole with? We have done the rework, and it works fine. I am just curious as to if I should fill the hole with epoxy. Thanks in advance, Kerry Kerry McMullen Principal New Product Mfg. Engineer LTX Corporation 825 University Avenue Norwood, MA 02062-2643 (T) 781-467-5468 (C) 508-631-1832 (F) 781-461-0993 --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------