Mail*Link(r) SMTP FWD>Operating Temperatures of FR-4 material Bob, I didn't receive all of your message, but it seems your customer wants to run some printed board assemblies or printed board material at lower than ambient in the 200-230 degree K range. FR-4 and most other epoxy and polyimide based, glass reinforced, printed board resin systems have been operated at low operating temperatures with little or no problems. Generally no problems in the 200 degrees K range. When you go cryogenic (a few degrees K) though, one thing to be careful about is mechanical flex -- Ralph Hersey Lawrence Livermore National Laboratory email: [log in to unmask] -------------------------------------- Date: 4/15/96 6:27 PM From: Bob Spaniol material. While it seems clear that the upper limit would be below the Tg of the laminate, how far below. And what would be considered the lower operating temperature. My customer wanted to know if the board would still function at -40 degrees C. I have know idea of the end use of the product. Thanks in advance!!! ------------------ RFC822 Header Follows ------------------ Received: by quickmail.llnl.gov with SMTP;15 Apr 1996 18:26:35 -0700 Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id UAA24224; Mon, 15 Apr 1996 20:16:59 -0700 Resent-Date: Mon, 15 Apr 1996 20:16:59 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0u8y5v-00009LC; Mon, 15 Apr 96 18:54 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Date: Mon, 15 Apr 1996 16:55:28 -0700 Message-Id: <[log in to unmask]> From: [log in to unmask] (Bob Spaniol ) Subject: Operating Temperatures of FR-4 material To: [log in to unmask] Resent-Message-ID: <"GQpO82.0.w_K.L6kSn"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/3456 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask]