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May 2004

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 14 May 2004 10:09:35 -0500
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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they have been "superseded" by more current testing which makes some of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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