Hi Dave,

Not really. It doesn't "burn" or "curl" much under the beam, so it's solid.

Vladimir

---- On Wed, 09 Dec 2015 15:51:29 -0800 David Hillman<[log in to unmask]> wrote ---- 
 > Thank you Steve! 
 >  
 > Vlad - does the substance slightly charge in the SEM? 
 >  
 > Dave 
 >  
 > On Wed, Dec 9, 2015 at 5:46 PM, Steve Gregory <[log in to unmask]> 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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