Sometimes the laminate and solder mask are not up to IPC standards, which  
with aqueous cleaning, cannot sustain the prolonged elevated temperatures needed 
 for drying without damage. The tendency then is to under-dry the pcbs, which 
 allows for moisture retention and possible current leakage. 
 
Have seen this happen in some overseas operations some years ago. In one  
case it was the laminate, in another it was the solder mask which allowed the  
retention of water soluble flux residues.  

Bill  Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO  80526
Tel: 970.207.9586   Cell:  970.980.6373

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