Hello Techies - In my search for information concerning the low-end operating temperature of FR-4 I've been getting the Cold Shoulder. High temperature information abounds but I have need of information for substrate performance below -40°C. -52°C, to be precise. Any experiences or resources that can be shared will be most appreciated, including materials other than FR-4. Cheers! Bob Lazzara Circuit Connect, Inc. TEL (800) 560-9457 TEL +1 706.245.4232 FAX (888) 453-0520 FAX +1 706.245.4299 --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------