Hi Technet!
          
          My purchasing comrades need to purge old PWB stock items.  
          They would like to know what the rule of thumb is for shelf 
          life of fused tin/lead coated PWBs.  Now, I've seen 
          assemblers try to solder four year old PWBs and they didn't 
          succeed very well.  But I couldn't give them a definitive 
          answer for this question.  Is their any IPC documentation 
          available or any other references.
          
          Dave Hillman has already offered to do a SERA test to check 
          the tin oxide, but accountants don't understand that.  
          Thanks in advance.
          
          Regards,
          
          Dave Sullivan
          Rockwell Collins, Inc.
          
          [log in to unmask]

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