http://en.wikipedia.org/wiki/Nickel Looks like Nickel is magnetic. They explain why the US coin we call Nickel is non-magnetic because it is mostly copper. I know that in Microwave circuits nickel is very 'lossy' and an undesirable finish component for that reason... Maybe someone with some metallurgy background can elaborate on the alloy that you end up with when applying ENIG to the circuits on a board. Bill -----Original Message----- From: Guy Ramsey [mailto:[log in to unmask]] Sent: Thursday, June 21, 2007 8:39 AM To: [log in to unmask] Subject: Re: [TN] PCB Finish I thought the EN in ENIG stood for electroless nickel. Is electroless nickel non-magnetic? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Wood, Kenneth Sent: Thursday, June 21, 2007 9:46 AM To: [log in to unmask] Subject: [TN] PCB Finish Hey all, Question: I design PCB's for MRI use so Nickel is no good because it is magnetic. Is there a standard finish I can use that does not whisker like tin, has no nickel like ENIG and can be made by anyone (most at least). What about Silver? Thanks Ken __________________________________________ Kenneth Wood Senior PCB Designer Invivo Corp. 12601 Research Parkway Orlando, FL 32826 Phone: 407-275-3220 ext. 179 Mobile: 407-340-2668 Fax: 321-239-1910 Email: <mailto:[log in to unmask]> [log in to unmask] Internet: <http://www.invivocorp.com/> http://www.invivocorp.com --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------