Hi Greg,
 
I'm assuming you're looking for "sulfur free" packaging for PWBs with silver finish?
 
If so, search on "silver saver paper" and check out the product specs for them.
 
From one old chemist to another.
 
Gerry
 
> Date: Wed, 9 Apr 2014 16:49:10 +0000
> From: [log in to unmask]
> Subject: [TN] Definition of Sulfur Free
> To: [log in to unmask]
> 
> Anyone have a working definition of "sulfur free" as it impacts solderability of silver finishes?
> 
> As an old chemist I would expect the definition "sulfur free" could have both a concentration and a time a part can be exposed to that concentration before soldering is impacted.
> 
> Any thoughts/assistance is appreciated.
> 
> Greg Munie Ph.D.
> Director of Design Programs
> +1-847-616-7100 tel
> +1-847-597-2803 direct
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