Thank you Mike
---- On Thu, 10 Dec 2015 05:03:38 -0800 Mike Fenner wrote ----
>I have seen something similar before with Sn/Ag solders and also high leads,
>both in die attach applications with longish reflow cycles.
>Whether that's relevant or coincidence couldn't say. Thought it could beat
>the time.
>The Sn one may be the same as here. Then the analysis reported only Sn, but
>the reporter may have dismissed any O (and C and H etc) as background from
>laminate. I'm not sure the cause was ever identified but am sure it was a
>long time ago. I will have to go back through some archived stuff and hope I
>can find something.
>
>--
>Regards
>
>Mike
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
>Sent: Thursday, December 10, 2015 12:53 AM
>To: [log in to unmask]
>Subject: Re: [TN] What else it can be
>
>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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