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April 2007

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Subject:
From:
Gerard O'Brien <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gerard O'Brien <[log in to unmask]>
Date:
Tue, 3 Apr 2007 12:24:41 -0500
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Paymon - if you wish to contact me off line, I have real time shelf wetting
balance data for all the surface finishes and was the individual who ran the
solderability testing for the 4552 and continue to test samples after 50
months of un-protected storage.

Regards

Gerard O'Brien.
Co-chair 4-14 plating committee
516 609 1230

-----Original Message-----
From: Paymon Sani [mailto:[log in to unmask]]
Sent: Tuesday, April 03, 2007 9:18 AM
To: [log in to unmask]
Subject: [TN] ENIG PCB Shelf Life

Hello All,



What is the expected shelf life for PCBs with ENIG finish? IPC-4552,
Table 3-1 suggests the PCBs to meet solderability requirements of
category 3 durability with six months shelf life. I would appreciate
your response to the following questions:

1-       How should the PCBs be handled during this time period?

2-       What should be the temperature swing?

3-       What should be the humidity range?

4-       What if the PCBs are older than 6 months and cost a lot of $?
How could we justify to use them?





Thank you in advance,

Paymon


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