Frank, Please do NOT call silver, or any other surface finish 'highly solderable'. Surface finishes are NOT soldered to; they certainly promote the flow of solder across the surface that the surface finishes cover, but the surface underneath the surface finish need to be solderable and wetted to. These highly soluble (in tin) surface finishes (gold, silver, sometimes copper) are very thin and go into solution with tin almost instantaneously. These surface finishes can be dangerous, because they give the appearance of good wetting whether or not good wetting has taken place. You can get good coverage this way without good wetting to the base metal underneath. Werner Engelmaier Engelmaier Associates, Inc. Electronic Packaging, Interconnection and Reliability Consulting 23 Gunther Street Mendham, NJ 07945 USA Phone & Fax: 201-543-2747 E-mail: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************