Gary,? 

We need a bit more information here.? You say "covered tote" and the critical item here is a vapor barrier.? Immersion silver is tranished by the diffusion of hydrogen sulfide gas?(or other sulfur bearing?gases)?from the cardboard.? Air flow will not defeat diffusion.?The gas laws work - higher pressure (and not much at that from just fan circulation) may limit gas movement into the tote.? However, you really need a gas-tight seal to prevent tarnish.? With a quality vapor barrier bag, you can ship immersion silver boards in cardboard.? If your totes are not sealed, your boards are going to tarnish. 
Air movement helps particulate in the air - smoke, fumes, etc. but does not do much for diffusion.? 

Denny Fritz
MacDermid, Inc.? 


-----Original Message-----
From: Gary Camac <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, 2 Feb 2009 2:24 pm
Subject: [TN] Storage of Iag PWAs



Good day all,

I am looking for some guidelines that I fear don't exist.  If you had a
PWA with an Iag finish, which is stored in a covered conductive tote,
how close could the container be stored to sulfur bearing cardboard
boxes.  This could be in conditioned factory air or slightly less
conditioned warehouse air.

I see the variables as the number of sulfur emitters (boxes in this
case) in the area and how much the air is turned (lowering sulfur
concentration). 

Your thoughts would be appreciated.

Gary Camac
Senior Manufacturing Engineer
DICKEY-john Corp.
5200 Dickey John Road
Auburn, IL 62616-0010
Telephone 217-438-2288



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