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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