The dilemma for Dewey and IPC-4101 is that this is raw materials specs. You might say it govern laminate mfg and incoming inspection. BUT, it doesn't cover the APPLICATION, USE, COSTS and RELIABILITY, and it can't. Electronics is such a BROAD FIELD, that the simple slash sheets are going to be applied from: 2-sided to 40-layer, from 18 months life to 20 years, from 0.020" to 0.300" thickness, from tin-lead soldering to CuSn soldering, from no-rework to 3X rework cycles. All of these conditions require something different from the raw laminates and prepregs. Dewey in the committee meeting talked about a "Finish Multilayer Standard for Materials" that was needed, because the IPC-4101 A/B Slash Sheets can't possibly be adjusted to cover all the cases above. Happy Holden Asian Pacific Materials Werner Engelmaier <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 05/26/2006 09:44 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] Rohs Weeeeeee board material Hi Doug, Of course I do not suggest Tg 178 instead of 175; but the slash sheets give ranges on the same sheet thast include Tg's with 50 degree differences--they should perhaps be no ore than about 20. Werner --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------