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Date: | Wed, 19 Apr 2006 13:30:20 EDT |
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In a message dated 4/19/2006 12:02:59 PM Eastern Daylight Time,
[log in to unmask] writes:
Does IPC have such a
specified standard or paragraph informing self life of lead free coated
bare PCB
Shelf life is an issue that IPC does not specify. The reason is that the
storage conditions vary around the world, and from season to season. The
solderable life in Singapore could be a lot less than in Minneapolis.
What is specified are "stress conditions" and "stress methods" that you can
use to determine if your part will still solder, after storage. Or, you can
use the stress methodologies to determine that the incoming part you receive
today will have the same storage capability as the part you received last
week. Hopefully, IPC methods will tell you if you are getting good parts
consistently, and not getting poor storage parts occasionally.
Denny Fritz
IPC Task group chairman 5-23d, Alternate Board Finish Solderability Testing.
MacDermid, Inc.
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