Tom,
      The boards should not be a concern simply because of their age.  I 
have worked with boards that were not solderable after 2 months and I have 
boards that were 12 years old and soldered very well.  In my opinion, the 
quality of the plating processes and the purity of the metals used have a 
major role in a board's shelf life.
       If you are still concerned about reliability, have some cross 
sections done as Dave suggests.  If you are dealing with a quality shop 
there should not be a problem.  It would be interesting to know why they 
went to the trouble of doing a second reflow.

          Norm Dill
 ----------
From: [log in to unmask]
To: [log in to unmask]
Subject: PCB board age
Date: Monday, September 16, 1996 6:43PM

We stuff and solder (both wave and hand) small runs of PCBs (primarily PTH
components. Our boare board requirements include individual packaging and
boards no older than 6 months. A supplier recently shipped us boards that
were re-reflowed 9 months after their original fabrication. Is this
acceptable within A-610 for hi-rel commercial applications?  Thanks.

Tom Moore
Electro Plasma
Tom Moore


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