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August 2011

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Subject:
From:
"Woolley, Mark D. (Mark)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Woolley, Mark D. (Mark)
Date:
Wed, 10 Aug 2011 08:40:49 -0600
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My fluorescence spectrometer does not detect silver (Ag) in the alloy.
It cannot detect anything below Aluminum.  I could perfomr an EDX in the
sem on a sample, and we are asking our vendors what they use.  Like you
I had difficulty believing they would be using pure tin, because of the
dissolution of copper during the plate.  The copper would quickly poison
the bath and change the alloy composition.
SN100C loungs like it might fit me ydata.  The copper wopuld be
overlooked by the XRF Spectrometer because it used an x-ray exciter
beam.and the Germanium is in very low amounts and could easily be missed
it the tech is not carefully looking for it.

Thanks,
madk



mark
Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster, CO 80234  USA |
Voice (Lab): (303) 538-2166 | email: [log in to unmask] |


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Wednesday, August 10, 2011 7:09 AM
To: [log in to unmask]
Subject: Re: [TN] Lead Free HASL and whiskers

I would think LF HASL would be SAC, or a high tin alloy (similar to
SN100C). Not pure tin


Amol Kane | Process Engineer
Catalyst Manufacturing Services, Inc.
941 Route 38, Owego NY 13827
Phone: (607) 687-7669 Extn 349 | Website: www.catalystems.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Honsowetz, Eric
Sent: Wednesday, August 10, 2011 8:57 AM
To: [log in to unmask]
Subject: Re: [TN] Lead Free HASL and whiskers

Good Morning Mark,

The classic answer ... it depends ...

Is there an industry standard for Pb-free HASL?  IPC does not appear to
have a specification.

The drawing or procurement document might define the material used ... 

It would be expected that the HASL would be a common soldering material
which would not be pure Sn.

Pure Sn would probably be a difficult material to use for HASL due to
its tendency to react with Cu. 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D.
(Mark)
Sent: Tuesday, August 09, 2011 6:19 PM
To: [log in to unmask]
Subject: [TN] Lead Free HASL and whiskers

I have a question now that our company is beginning to use lead free
HASL as a solderability finish.  I am seeing a few (<5%) filled vias on
each board I examine.  Does anyone know if the manufacturer's are using
pure tin, and if they are has anyone looked at tin whiskers from HASL
filled vias?

Thanks,
mark


mark
Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster, CO 80234  USA |
Voice (Lab): (303) 538-2166 | email: [log in to unmask] |


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