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No clean flux VS washing
1031 1 Mar 27.2019, 09:32:22

Currently the PCBA are washed after they are assembled,  The assembly house requested to use no clean flux,
comparing the two process what are the disadvantage/ advantages and what types of problems should I look out fore? 
thanks

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A****min

Mar 28.2019, 11:06:10

If you have high impedance circuits, the no-clean flux residue can absorb moisture and sometime later become conductive.
Also, if the equipment is operated in a dirty environment, the flux can react with the airborne contaminants and cause similar problems.
But, if you can get away with no-clean, then it saves a whole process after stuffing and reflow.  I make most of my boards with no-clean, and they do fine except in special cases mentioned above.

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