It varies

---- On Wed, 09 Dec 2015 16:44:26 -0800 Yuan-chia Joyce Koo  wrote ---- 
>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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