Water when very clean, resistively above 12 Mohms will clean many things
(it will etch glass & stainless steel) but how it would work on grease
it another item.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, August 24, 2006 4:58 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] water as a solvent
You and Eric have really been paying attention in class.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahne Oosterhof
Sent: Thursday, August 24, 2006 1:54 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] water as a solvent
And I thought you meant "they are all wet".
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, 24 August, 2006 12:35
To: [log in to unmask]
Subject: [TN] FW: [TN] water as a solvent
After sending this, Mr."it depends" sent me a message questioning my
lucidity. I said I never worked in that company, but to keep my comedy
enterprise solvent, I will explain.
The people must be bi-polar and if the water was it would be a great
cleaning medium( as opposed to the clairvoyant midget that escaped from
prison; small medium at large ), because I should of seen this coming,
just
like when I had created the perfect solvent, but couldn't find anything
to
keep it in.
Dewey
-----Original Message-----
From: Whittaker, Dewey (EHCOE)
Sent: Thursday, August 24, 2006 11:31 AM
To: 'TechNet E-Mail Forum'; 'Barmuta, Mike'
Subject: RE: [TN] water as a solvent
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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