I have heard that there can be some outgassing from the bags, but at the
assembly level the soldering is already finished, so only the unused
holes/pads that are unsoldered can be affected. Usually they may tarnish
somewhat either from the bag or other chemicals in the air, as noted in
previous postings in the last two or three days. Unsoldered silver can
tarnish from chlorines, sulpher from exhaust byproducts from vehicles or
power plants, and many other things. However, this tarnish is not
usually a cause of compromised electrical integrity; it does not lead to
failure. 
On the other hand, PWBs (unassembled and unsoldered fabricated boards)
probably should not be stored in ESD bags, as I have heard that they can
outgas and affect the solderability. 
The board vendors should be able to give us more information on this
topic.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha
Sent: Tuesday, March 07, 2006 11:00 AM
To: [log in to unmask]
Subject: [TN] silver and static shield bags

How will silver coated boards do in static shield bags? Any
contamination issues?

Thank you,
Eddie Rocha

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