Dave, thanks for your comments. You are definitely right about Mother Nature, but that`s my concern. How much lead will be "washed" by the solder wave ? What has to be done in order to get a leadfree composition if Sn63/Pb37 is used as a plating or lead finish? As I said - no concerns about a mixture of Sn/Pb/Ag, the (mechanical/thermal) properties ? By the way, any idea where I can get access to the papers you mentioned ? Regards, Christian *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * 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] * ***************************************************************************