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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