You can get the laminate certified to class A, B, C or D. For 5 core, class A is +/- 1.5 mils. We typically order class C which is +/- 0.7 for 5 core. We find though that most of the laminate falls within class C regardless of what class you order. Rick Babyak Process Engineer Proto Circuit Inc. 7 Ascot Parkway Cuyahoga Falls, OH 44223 330-572-3400 --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------