Graham, I'm sure glad you're involved. I know what the testing is. I'm continually confused about its usefulness and anyone's ability to specify how testing yields are to be specified or indicated on master and assembly drawings. Now, I have another thing to deal with. Ok by me. Just tell me how to deal with it, please. Also, does this mean we now need to re-assess our position on single vs. multiply MLB core and prepregs. Used to be we used minimum two ply constructions primarily to avoid just such possible "shorting." MoonMan --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------