Moon nice insight, Your supplier should have this ready for you. You may have a good board house but a poor match to your needs. We have all kinds of wild and crazy materials, but for the FR4 family these are some panel stock numbers. Keep in mind core thickness varies, and these numbers are very rough; Cu Min Max h/h 2400 5000 h/1 800 1300 1/1 3450 7000 1/2 100 200 2/2 500 1000 As you can see .5 (h) is king today, but 1/2 is always in stock. Morale of the story... add this as an item when doing supplier surveys. The hardest working (and most clever) in any PCB shop is the Purchasing person. All these materials have a shelf life, cost a bundle (pun intended) and have limited storage space as controlled environment is recommended. If not careful your lams can pile up. Boston Brad Coretec FAE 781 858 0783 --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------