Dave,
	Trying to stop production of an assembly in never a good idea, but 
there may be some ways to get away with this.  Let look at you ideas 
first.
>         1- Does storage in nitrogen chambers help?

	Storage in nitrogen may not be doing what you want.  The nitrogen 
chambers we have are used to control the relative humidity inside the 
chamber.  I sure this process displaces some of the oxygen, but as to 
how much, I could tell you.  Besides, the evaporation of the 
volatiles in the paste may be your biggest concern and a nitrogen 
chamber wont help that and may make your situation worse.

>         2- Who manufactures nitrogen chambers?

	Ours was made by Terra Universal in Anaheim, CA.  There phone number 
is 714/526-0100.      

>         3- Does refrigerated storage help?

	You would need to be very careful how you handled this one.  If your 
refrigerator is too cold and the air is humid, you may end up with 
condensation on the board.  This would not be a good thing, no matter 
how you look at it.  Also, you would need to wait for the boards to 
warm up to room temperature before re-entering them into the 
production flow.

>         4- Any technical papers/resources available in industry?
      
	Not that I know of off the top of my head.  This is not to say there 
aren't any.  If you still want them, I can have our librarian do a 
search for you.

	The first thing you need to do is determine the life of the paste 
you are using.  Use the old engineering approach, if it is not broke 
don't fix it.  If you still have a problem, you may need to look for 
a paste with a longer production life.

	If I can be more help, let me know.

Sincerely,
John Guy
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