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Hi Dieter! The reports you mentioned are good references but unfortunately
they have been "superseded" by more current testing which makes some of
those report conclusions inaccurate and dated due to surface finish and
solderability testing technology/process improvement advances.
Dave
Dieter Bergman
<DieterBergman@ip To: [log in to unmask]
c.org> cc:
Sent by: TechNet Subject: Re: [TN] Steam aging equivalent shelf life extension
<[log in to unmask]>
05/14/2004 09:33
AM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to Dieter
Bergman
Linda,
Several years an IPC task group tried to correlate 2 years of storage
with a 24 hour steam aging test. The findings were that 24 hours was two
severe for some products. That round robin test program was used to
lighten the requirements in the J-STD-002 and J-STD-003. It was a great
exercise and taught us about the differences between "solderability" and
"Soldering Ability". The report is IPC-TR-462:
Solderability Evaluation of Printed Boards with
Protective Coatings Over Long-Term Storage
This document provides conclusions and recommendations
for the effectiveness of different protective coatings and
coating application methods. PWB solderability in typical
storage conditions after various time periods as well as the
correlation of time and storage conditions to thickness and
coating characteristics are addressed. Not available in
electronic format. 63 pages. Released October 1987.
The coatings of course were those used in the 1980's. Another group also
took up the challenge and did a literature search plus some additional
testing. This was documented in IPC-TR-464.
Accelerated Aging for Solderability Evaluations
The report was developed to meet the growing need for a
standard method of evaluating the solderability retention
capability of printed boards during inventory storage. Not
available in electronic format. 32 pages. Revised April 1984.
Includes 7 page Addendum, released December 1987.
There is a lot of good data in these reports that might be useful in
checking the robustness of the surface finishes being used today.
I hope that this helps. Best regards,
Dieter
-----Original Message-----
From: Linda Woody [mailto:[log in to unmask]]
Sent: Tuesday, May 11, 2004 12:35 PM
To: [log in to unmask]
Subject: [TN] Steam aging equivalent shelf life extension
I'm trying to find out what the equivalent shelf life extension for
solderability is when using steam aging. Does an 8hr. steam aging
correspond to some # of months expectation for good solderability. Is
there
a formula for hrs. steam aging vs. months of solderability?
Any/all info. is appreciated.
Linda Woody
Lockheed Martin
Missiles and Fire Control Systems
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