where is the origin of the pwa?  (country of origin).
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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