As various correspondents have stated, just looking at a galvanic series is not enough to predict corrosion problems. British Standards publishes a very useful guide based on theory and practise entitled "Commentary on Corrosion at Bimetallic Contacts and its Alleviation". Document number PD 6484, latest price I found was £68 to non members. I used this document extensively some years ago when my job was investigational metallurgy. Happy days! Regards Eric Dawson --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) 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 ---------------------------------------------------------------------------------