Can anyone tell me how to convert Megohms / sq. inch  into (g / sq. cm ?
Also, section 5.0 of IPC-A-600E states the resistance limitations for =
solvent resistivity to not be less than 2 x 10 to the 6th power  /  cm. =
Should not the cm be squared to provide a surface area? All help is =
appreciated.

Thanks,

Ed Cosper
									
									     
 Ed: I think you may be mixing apples, oranges and units.		     
     Volume resistivity is measured in ohm-cm. This can be correlated to 
milligrams of ionic material contained in a liter of extract solution(ppm).	
     Salt, NaCl is used as the equivalency factor. A resistivity reading of  
 two megohm-cm is equivalent to 1.56ug/cm2 of NaCl in the extract solution.  
     The higher the resistivity reading the lower the equivalent salt 
content.								     
     If you are trying to convert from sq.in to sq. cm  for NaCl equivalence 
use the following: 10.06ug/in2 = 1.56ug/cm2,BTW these are upper acceptability 
 limits.        Hope this helps if not give me a call.			
									
									
Regards									
	Michael Barmuta							
	Staff Engineer							
	Fluke Corp.							
	Everett Wa.							
	206-356-6076
 
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