Bev,
What is the significance of the cardboard being nearby?
Doug
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Tuesday, December 21, 2004 11:42 AM
To: [log in to unmask]
Subject: Re: [LF] Silver emersion shelf life.
Carol,
It will also depend on your "air" - how much SO2 and H2S it has in it.
Any cardboard nearby?
Bev Christian
Research in Motion
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Lee Parker
Sent: December 21, 2004 11:33 AM
To: [log in to unmask]
Subject: Re: [LF] Silver emersion shelf life.
Carol
Immersion silver was first introduced into North America by the AT&T
facility in Richmond, VA. We test the coating in numerous facilities
across the country prior to production. We found the coating to have at
least a year of shelf life in these environments. There was also
extensive laboratory work performed to verify the long term reliability
of the coating.
Best regards
Lee
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Carol Spiers
Sent: Tuesday, December 21, 2004 11:21 AM
To: [log in to unmask]
Subject: [LF] Silver emersion shelf life.
Does anyone know the shelf life of unpopulated silver emersion boards
that are exposed to air. I am concerned about the finish being
compromised and subsequently affecting solderability in a pbfree
process. I have been asked specifically if tarnishing over time is an
issue or will the more highly active fluxes take care of this issue when
eventually processing these boards. Also, can anyone suggest an
appropriate thickness for silver emersion coating on boards. As all I
can find are cautionary notes stating the "thinness of the coating can
be an issue as higher soldering temperatures could result in
out-diffusion of base metals and oxidation, leading to reduced
solderability."
Once again, any advise/information provided will be much appreciated.
Regards
Carol
C. M. (Carol) Spiers
Director of Operations
Interalia Inc.
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