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December 2009

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Subject:
Re: Storing of Copper Sheets
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 8 Dec 2009 16:39:34 -0600
Content-Type:
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Hi Bob - unfortunately you are going to lose the solderability of those 
sheets somewhere in the 6-12 month time frame depending on which immersion 
tin formulation you are using and due to diffusion issues will lose the 
solderability of the sheets on a permanent basis somewhere in the 12-24 
month time frame depending on the thickness of the immersion tin plating. 
You may be able to "reactive" the surface for some other operation but you 
will need to somehow make sure the surfaces to not passivate (aka oxidize) 
preventing the next process operation. My recommendation is talk to your 
favorite plating supplier. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]



bob wettermann <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/08/2009 11:11 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
bob wettermann <[log in to unmask]>


To
[log in to unmask]
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Subject
[TN] Storing of Copper Sheets






Dear Technetters:

If you planned on storing 10z copper sheets with a bright immersion tin 
coating for several years in 24 x 24" sheets-how would you do it?

We have several internal opinions from interleaving of saver paper to 
moisture barrier bags to other types of bags.

Thanks!

Bob Wettermann

PH 847-767-5745

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