No, we used the same material to shrink wrap immersion silver boards as we had been using for HASL. We were told by the chemical supplier this would be sufficient and by all observations, this was the case.
Some studies we carried out years ago that showed most of these plastic wrapping materials present an substantial barrier to the diffusion of gases such as sulfur. So I am at a lost to understand why we now have a concern about the storage of immersion silver boards in shrink wrap packages.
We were using these wrapping materials 10 years ago on immersion silver board and did not experience any issues. What has changed?
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: MA/NY DDave<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Friday, August 05, 2005 12:42 AM
Subject: Re: [LF] Protection by immersion silver
Hi Lee, Gordon, Graeme, IPC LF Listservers,
Guys, Gals, Gordon, Graeme, gFabulous gtopic
Lee, Since the atmosphere and chemicals permeates sealed bags at a rate to
create environmental equilibrium did you use specially designed bags and
then store these bags in a special environment to obtain the unlimited
storage time you noted?
Yours in Engineering, Dave
YiEngr, MA/NY DDave
P.S. Gee, Lee no longer with that Phila company
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