Thank you Steve,

Vladimir

---- On Wed, 09 Dec 2015 15:46:07 -0800 Steve Gregory  wrote ---- 
>Hi Dave and Vlad, 
> 
>I have it up here: 
> 
>http://stevezeva.homestead.com/What_else_it_can_be.pdf 
> 
>Steve 
> 
>On Wed, Dec 9, 2015 at 4:34 PM, David Hillman < 
>[log in to unmask]> wrote: 
> 
>> HI Vlad - we can't open Dropbox here due to firewall restrictions so can 
>> you have Steve G. post the pictures? 
>> 
>> Dave Hillman 
>> Rockwell Collins 
>> [log in to unmask] 
>> 
>> On Wed, Dec 9, 2015 at 4:59 PM, Vladimir Igoshev < 
>> [log in to unmask] 
>> > wrote: 
>> 
>> > HI everyone, 
>> > 
>> > I'm attaching a link to a file showing something I'd appreciate your 
>> > thoughts on. It's a cross-section of a QFN on an IAg board; 
>> > Pb-free/no-clean process. As you can see from the EDS spectrum, that 
>> > greyish stuff between pins has pretty much only Sn and O in its elemental 
>> > composition. 
>> > 
>> > I know there is burn flux residue around solder joints but that stuff 
>> > doesn't have any C in it. The question I have is what is it. 
>> > 
>> > I spoke to Bev and both of us are still puzzled. 
>> > 
>> > Here is the link: 
>> > 
>> https://www.dropbox.com/s/3wbj62vqjyhvj2y/What%20else%20it%20can%20be.pdf?dl=0 
>> > 
>> > Thank you very much in advance. 
>> > 
>> > Regards, 
>> > 
>> > Vladimir 
>> > 
>> > SENTEC 
>> > 
>> > 
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