Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 23 Sep 2003 22:47:17 -0400 Message-ID: X-Original-Return-Path: Received: from aerosurf.net ([216.167.68.224] verified) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP id 2600980 for lml@lancaironline.net; Tue, 23 Sep 2003 22:19:19 -0400 Received: from ieee.org [208.252.252.82] by aerosurf.net with ESMTP (SMTPD32-6.06) id A0E730DE0252; Tue, 23 Sep 2003 16:26:47 -1000 X-Original-Message-ID: <3F70FEFA.9040605@ieee.org> X-Original-Date: Tue, 23 Sep 2003 19:18:34 -0700 From: "Charles R. Patton" Reply-To: charles.r.patton@ieee.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: silver/copper conductive paint ground plane vs. corrosion References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To continue our discussion on possible corrosion of a Ag/Cu conductive paint ground plane. I was at the Sensor Expo today and talked to a company, Conductive Technologies: http://www.conductivetech.com/product/shielding.htm that prints conductive patterns on plastic (primarily flexible sheets) for shielding, keyboards and such. He confirmed my worries about Ag/Cu (silver plated copper particles) in that they are unsuitable for long term exposure due to corrosion. This company will basically only print pure silver or silver plated graphite (carbon) compositions. And even though the silver will still oxidize slowly (due to oxygen transmissivity of the paint and plastic overlays), the silver oxide still has 92% of the conductivity of the metal silver. . Just one more bit of information to absorb. Regards, Charles Patton