People who think that are what water should be to be effective.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Barmuta, Mike
Sent: Thursday, August 24, 2006 10:42 AM
To: [log in to unmask]
Subject: Re: [TN] water as a solvent

Hi Ed: I agree with you. Who in the heck said water is the best solvent
for cleaning PCB's? 

It's recognized as a "universal" solvent because it has the ability to
solvate so many elements, compounds and mixtures. It is a great
decontamination agent on polar/hydrophilic materials. 

However it is a terrible solvent when trying to remove
non-polar/hydrophobic residues. Obviously it requires a saponifier if
you want to remove these types of soils. Perhaps this is what they
meant.

	

	
Regards
	
Michael Barmuta
	
Staff Engineer
	
Fluke Corp.
	
Everett WA
	
425-446-6076

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Edward Mines
Sent: Thursday, August 24, 2006 9:31 AM
To: [log in to unmask]
Subject: [TN] water as a solvent

I have to disagree with the assertion that water is the best solvent for
cleaning PC boards.

  It may be good for many (or even most no clean fluxes) but water alone
will not touch various greases and oils including finger prints. Have
you ever tried to clean you hands
  with water alone after changing the oil in your car?

  I don't know the legal consequences of using traditional vapor
cleaning equipment or the current availability of effective vapor
cleaning solvents, but I do know that vapor cleaning with trichlor was
very effective when it was the industry standard. Other solvents will
work too.

  It is important to remove all oily residues (finger prints, mold
release agents etc) from PC boards prior to conformal coating -
otherwise incomplete coverage can take place.
  Both MIL-I-46058 & IPC-CC-830 state that conformal coatings should be
free from voids, skips and other breaks in the coating.

  Ed Mines


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