If I may suggest, contact David Hillman, Rockwell International, Cedar Rapids, Iowa. Internet address: [log in to unmask] Dave has had extensive experience with SERA technology, examining the solderability of various finishes with time. Dave also heads us the IPC committees on J-STD-002 and 003, which deal with the solderability of components and boards. Doug Pauls aka [log in to unmask] Contamination Studies Labs.