Recently we received PWB's with actual internal widths (1/2 oz. 
     cu)less than the recommended .004".  They measure in the .0025" - 
     .003" range.  The PWB's are fully populated (100% SMT) and the problem 
     was not uncovered until in-circuit test revealed some out of tolerance 
     conditions on some low resistance circuits.  The lines are adequate 
     for both current carrying and temperature rise concerns.  The real 
     question is one of reliability and trace/via hole integrity.  Since 
     this will be an expensive decision in the event of scrapping the 
     assemblies, I trying to find any source of data or experience that 
     suggests that .002" 1/2 cu traces are reliable over a temperature 
     range of -55C to 125C.  Thanks in advance for any information.
     
     JWeiss
     Harris Corp.
     
     

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