======== Original Message ======== Sender: [log in to unmask] Received: from simon.ipc.org (IPC.ORG [168.113.24.64]) by arl-img-3.compuserve.com (8.6.10/5.950515) id WAA01212; Wed, 2 Oct 1996 22:41:52 -0400 Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id VAA25633; Wed, 2 Oct 1996 21:35:03 -0700 Resent-Date: Wed, 2 Oct 1996 21:35:03 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0v8dXu-0000QPC; Wed, 2 Oct 96 21:29 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Message-Id: <9610030140.AA0723@augat> To: TechNet <[log in to unmask]> From: Carey Ritchey/KENT/COM/AUGAT <[log in to unmask]> Date: 2 Oct 96 17:38:44 Subject: RO40003 and RO4350 Mime-Version: 1.0 Content-Type: Text/Plain Resent-Message-ID: <"5V1Sn3.0.o5G.WKoKo"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/6653 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] Has anyone built a 4 layer mulitlayer PCB utilizing Rogers RO4003/4350 materials for two layers and FR4 for the other 2 Questions : what type of stack up did you use we are imagining 0.020 RO double side material FR4 prepreg and 0.020 FR4 double side for a finished of aprox 0.062 What happens to flammability rating if you hybrid 94VO rated FR4 with non rated RO4003 Can we still expect UL approval if we utilize FR4 and RO4350 which is 94VO rated Also what sort of cost saving is to be expected by utilizing FR4 for the non critical layers. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** ======== Fwd by: Tony King / N ======== I have processed panels of this construction, though test designs only since I do not have UL approval for RO4003 in a mixed construction (and Rogers did not have UL on RO4003 at the time). I would be happy to discuss the experience with you in specifics. Over all though, the build was very successful. No manufacturing problems encountered, actually some improvements were noted as result of this mix. Please call to discuss in more detail. Tony King Elexsys International Inc. Nashua N.H. Phone: 603-886-0066 [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************