Hello TN, When soldering to a ceramic board with silver tracks sintered to it, has anyone come across a requiremnt to use a higher silver content than SAC to prevent leaching of the silver? I'd assumed that the (almost) 4% silver in SAC would have been more than enough to make the solder and substarte virtually electro-chemically equal and prevent leach/dissolution. Pre pb-free, I remember reading about folks using 96S alloy (Tin & 3.7% Ag) to solder to such boards. Given the liquidus point of 96S, I wouldn't have thought there would be much differnce with SAC. Any ideas anyone? cheers Greg --------------------------------------------------- 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 -----------------------------------------------------