A couple of months ago there was a discussion thread running on the merits of immersion silver boards.  One of the contributors (Jack Olson, I think) made the comment that -

"Most sources say a silver surface will not be solderable after a month or so unprotected. (Even in a baggie it will be okay a year later?)"

What are these "sources"?  Are there published articles giving guidelines on how fabs should be packed to maximise shelf-life?

Basically, we've just received some Immersion Silver boards from fab house which were wrapped in tissue paper then bubble-wrap.  Not in sealed bags or anything.  They claim boards should be OK, even though we won't be using all supplied boards for a few months.  They have offered to repackage if we insist on it.  I'm a little concerned, having seen how Immersion Silver boards can easily tarnish.  

I'd be interested to hear what TechNet contributors have to say on this matter.

Thanks in advance for your replies

Lorraine Reid
Senior Electronics Engineer
Trivirix International 
tel. +44 (0)28 9096 0932

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