Ryan; Thanks for the information, as this is not my are of expertise, I was concerned about the several thousand hours. Is there some documentation that has information on how different material hold up under extended periods of time under these conditions? Again thanks for you help. Regards Bob Torres -----Original Message----- From: rgrant [mailto:[log in to unmask]] Sent: Thursday, May 23, 2002 9:38 AM To: 'TechNet E-Mail Forum.'; 'Torres, Roberto' Subject: RE: [TN] PCB materials Bob, What you are asking for is not exotic. Board fab processes, and PCB assembly processes will have a bigger impact under those conditions than the raw materials in the PCB. Standard FR-4 and your favorite finish (including OSP covered copper) will work just fine. Regards, Ryan Grant -----Original Message----- From: Torres, Roberto [mailto:[log in to unmask]] Sent: Wednesday, May 22, 2002 12:53 PM To: [log in to unmask] Subject: [TN] PCB materials All; I am looking for some help in selecting material for a PCB we are designing to go into 85/85 (85°C / 85% humidity), aging (85°C dry bake), and temp cycle (-40°C to 85°C) ovens. I know that there are dozens of options out there for fabricating boards that will survive this, but I'm sure that some of them are considered standard processes that can be obtained inexpensively, and some of them more exotic. Could any of you offer some guidance? One of my biggest concerns is the metallization in the high-humidity environment. I think that copper could cause some serious problems here... but under a mask and with SnPb on all the exposed areas, maybe I'm wrong. Each of the boards must last a minimum of 1000 hours at these conditions, although several thousands of hours is obviously preferable, so that they can be reused. Any help provided would be greatly appreciated. Regards Bob Torres Roberto Torres CENiX Inc. 5141 California Ave, Suite 150 Irvine, CA 92612 Email: [log in to unmask] Tel: 949-428-2672 Fax: 949-428-2671 ---------------------------------------------------------------------------- ----- 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 the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- 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 the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------