The standard is reasonable. Perhaps your supplier is attempting to maintain the specified thickness across the board, which is not required. The thickness is to be measured on a flat unencumbered portion of the board or on a coupon processed with the board. > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Colin Weber > Sent: Tuesday, October 29, 2002 10:34 PM > To: [log in to unmask] > Subject: [TN] IPC-SM-840 > > > Hi Folks, > > Our company has specified; IPC-SM-840, CLASS T, 0.001-0.002" > THICK. on each board we have had manufactured for the last few years. > > I just received notice from our current manufacturer that > they cannot consistently meet this requirement for 1 to 2 > thou thickness, and want to produce a thickness at a minimum > of 0.4 thou. > > My questions are; > 1. Is this standard considered old and I should be looking at > specifying something else? 2. Are there any repercussions in > changing to the suggested reduced thickness? > > > > > Regards, > > Colin Weber > --------------------------------------------------- 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 -----------------------------------------------------