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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Vladimir Igoshev <[log in to unmask]>
Date:
Wed, 9 Dec 2015 16:55:00 -0800
Content-Type:
text/plain
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text/plain (151 lines)
No underfill or any other fancy stuff

---- On Wed, 09 Dec 2015 16:53:28 -0800 Yuan-chia Joyce Koo<[log in to unmask]> wrote ---- 
 > tin oxalyate used for epoxy catalyst... there were works for flux/  
 > underfill one step stuff utilize flux by product as catalyst for   
 > curing... (can't remember which group did that...) 
 >           jk 
 > On Dec 9, 2015, at 7:03 PM, Vladimir Igoshev wrote: 
 >  
 > > 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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