IPC-6018 requires 20 µ for class 1 & 2 boards and 25 µ for class 3. -----Original Message----- From: Richard Brennan [mailto:[log in to unmask]] Sent: Thursday, December 19, 2002 10:44 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 -----------------------------------------------------