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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