Richard: In addition to the copper plating thickness in the holes there is another issue you may want to look into. Since this is a PTFE for RF you should verify that the boards are being properly treated/conditioned to allow a good bond of the catalyst/electroless Cu to the hole wall. Although these are double sided and not MLB's the PTFE holes still need to be conditioned for proper bonding. Regards Michael Barmuta Staff Engineer Fluke Corp. Everett WA 425-446-6076 -----Original Message----- From: Richard Brennan [mailto:[log in to unmask]] Sent: Thursday, December 19, 2002 8:44 AM To: [log in to unmask] Subject: [TN] Plated Through Holes Hi everyone Can anyone tell me what the recommended thickness of the barrels of PTH's is? We have a minor problem with 0.4mm dia. barrels not giving good ground from top of board to ground plane on underside. Boards are double sided PTFE / copper track / Emersion tin RF boards. Richard Brennan Manufacturing Support Manager Health & Safety Manager Aerial Facilities Ltd Aerial House Asheridge Road Chesham Bucks HP5 2QD 01494 777000 Direct line 01494 777052 [log in to unmask] --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------