Lois,
        Aside from the initial condition of the boards when they went into
storage (no small matter), the nature of the storage will define the "shelf
life". Since this can vary there isn't a good single cut off date. Properly
cleaned PCB's wraped in non-reactive plastic (no leaking of release agents
used in the manufacture of some plastic bags), with a desicate package to
absorbe moisture will do nicely for quite some time.
        I seem to recall that IPC-A-610 makes a passing mention of
corrosion. In sort...It's not allowed! :-)

        Martin

>Date:    Thu, 3 Sep 1998 09:50:03 -0400
>From:    [log in to unmask]
>Subject: PCB Design Standards
>MIME-Version: 1.0
>Content-Type: text/plain; charset=us-ascii
>
>I am looking for a couple of different things......
>
>1.  Trying to locate information (IPC Std??) dealing with length of time a
>board can be stored.  We have
>      a situation with old boards now being populated & mfg is having
>soldering problems.  They were
>     populated dispite seeing oxidation in/on the thru-holes.
>
>2.  Would like a listing of all IPC Standards that deal specifically with
>the design of PCB's.  Possibly
>     looking for those that deal with the assembly of boards also.  Also
>need to know how to obtain these
>    standards for my office.
>
>Would appreciate any help someone can give me.
>
>Thanks to all,
>Lois Paletta
-------------------
Martin Spizman
 MEYER SOUND LABS
  (510) 486-1166
    [log in to unmask]

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