Does any IPC Standard recommend a minimal level of  PC Board, or PC
Assembly ionic cleanliness in terms of material per square unit of board
or assembly area?

E.g.   0.2 micrograms of sodium chloride equivalent per square
centimeter.

In IPC-A-600D, section 19.1 a solvent resistively value for an
IPC-TM-650 test is given (greater than 2 X 10 to power 6 ohm per
centimeter is recommended).

Even if an appropriate response to this question is complex can the
question itself be answered yes or no?

Thanks for any guidance. 



Kenneth Chafin


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