I don't believe that you read that for cleaning of the assembly itself.
The use of staticidal cleaners/coatings is described in MIL-D-1686 and
EOS/ESD STD 20.20 for cleaning/coating of SURFACES such as benches, etc.
where ESD-sensitive devices may come in contact (or within 6", which can
induce static charge). Sometimes it is used for cleaning or application
to certain surfaces to make them ESD safe, such as computer monitor
screens, plexiglass cabinet windows, etc.
If you can find the document that says to use only conductive cleaning
solvents to wash circuit board assemblies, I would like to see that. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - bogert
Sent: Monday, October 01, 2007 5:07 PM
To: [log in to unmask]
Subject: [TN] Cleaning of ESD Sensitive Circuit Boards

October 1, 2007

I recently reviewed an OEM'S ESD control procedure that required
cleaning solvents to be conductive for use on any ESD sensitive
assembly.  i also seem to recall reading this same requirement in some
ESD specification.

Using conductive cleaning solvents does not seem like the right
technical thing to do.  Although it may help regarding ESD protection,
seems to me we are at greater risk in event some of the solvent remains
on the assembly after the cleaning process.

Normally, our OEM'S use DI water and/or alcohol for cleaning non-rosin
based flux and for RMA flux, a solvent like Terpene with DI water or a
saponifier and DI water.

Are the aforementioned solvents conductive?  I don't believe DI water
should be since it should not contain ions.

Any info on this topic would be of use.  Thanks.

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