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]

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