Thanks to all so far---also appreciate qualifying remarks.

> _____________________________________________ 
> From: 	Chafin, Ken G.  
> Sent:	Monday, October 01, 2007 3:47 PM
> To:	[log in to unmask]
> Subject:	Ionic Cleanliness 
> 
> 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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