Yes, that is true. Everything lasts longer in Minneapolis, everything is
better here. No argument there. No salty atmosphere (except in the
peanut bars), good air conditioning, no real pollution to worry about.
Cold beer and warm food. Friendly folks. Good observation, Mr. Fritz.
:-) 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Wednesday, April 19, 2006 12:30 PM
To: [log in to unmask]
Subject: Re: [TN] Shelf Life of Lead Free Finish

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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