Murata, at http://www.murata.com have a good article on this subject. Mainly the reason is, that the aluminum electrolytic will loose 50% of the rated capacitance a -40 degrees C. At -55C it is worse. This then also is true for industrial applications. I just looked for the article that I am referring to and couldn't find it, so I am attaching it. Michael Wright Sr. Engineer ITT Cannon 952-974-5813 -----Original Message----- From: DUTTON Phil [mailto:[log in to unmask]] Sent: Tuesday, April 02, 2002 1:48 AM To: [log in to unmask] Subject: [TN] Aluminium Electrolytics Hello Technetters, Mil-STD-5400 para 4.3.8.2 says that aluminium electrolytic capacitors shall not be used in airborne electronic equipment. Can anyone please explain why this is so? thanks, Phil. ---------------------------------------------------------------------------- ----- 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 ---------------------------------------------------------------------------- ----- ************************************ If this email is not intended for you, or you are not responsible for the delivery of this message to the addressee, please note that this message may contain ITT Privileged/Proprietary Information. In such a case, you may not copy or deliver this message to anyone. You should destroy this message and kindly notify the sender by reply email. Information contained in this message that does not relate to the business of ITT is neither endorsed by nor attributable to ITT. ************************************ --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------