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home-brew Freon TF substitutes?

N

Nomen Nescio

Jan 1, 1970
0
I last saw this in the mid 1990s. I knew a warehouse that still
had some drums hidden away...
Bloody best cleaner ever. Although some liked Genklene,
now also banned.
There are some commercial spray cleaners that claim to be
almost as good. I would like something in bulk for dipping
computer boards. Isopropyl alchohol is suggested by some,
but has 9% water usually. I saw somebody write that they
used a mix of methylated spirits and naphtha. Sound like
it would clean stuff, but is flammable.
Know of anything?
 
J

Jeff Layman

Jan 1, 1970
0
I last saw this in the mid 1990s. I knew a warehouse that still
had some drums hidden away...
Bloody best cleaner ever. Although some liked Genklene,
now also banned.
There are some commercial spray cleaners that claim to be
almost as good. I would like something in bulk for dipping
computer boards. Isopropyl alchohol is suggested by some,
but has 9% water usually.

Not sure where you are, but isopropyl alcohol is usually available 99.9%
pure, with a negligible water content.
 
G

gregz

Jan 1, 1970
0
Jeff Layman said:
Not sure where you are, but isopropyl alcohol is usually available 99.9%
pure, with a negligible water content.


And by the time it's dried, it's picked up a lot of water.

Greg
 
G

gregz

Jan 1, 1970
0
gregz said:
And by the time it's dried, it's picked up a lot of water.

Greg

I always blew heated air after applying alcohol, to remove the water
droplets left.

Greg
 
I don't know if US parts suppliers even carry IPA in any percentage.

besides,after you open your bottle of 99% IPA,it probably absorbs enough
moisture from the air to drop it to 91%..... ;-)

Hmm,IIRC,Everclear (grain alcohol from a liquor store) is 95% ethanol.
I believe it's the highest % of alcohol lawfully sold for drinking
purposes.
Everclear is 95% because that's the azeotrope of the water and alcohol
mixture. This means that it boils at a lower temperature than pure
alcohol or pure water. So the 95/5 mixture boils before the pure
ethonal boils and that's what ends up in the bottle. When alloying
metals a similar thing happens and you get an alloy that melts at a
lower temperatute than either of the pure metals. In that case it is
the eutectic.
Eric
 
C

Cydrome Leader

Jan 1, 1970
0
Orson Cart said:
Methylene chloride is definitely not for electronic components.
It is used a paint stripper. I am sure it would require rinsing
off quickly with another solvent, otherwise your PCB would be
fuggered.
The sadly-missed chloro/fluoro-carbon cleaners would not damage the useful
stuff like plastics, rubber, lacquer, metal, paper et ecetera.

plus they didn't leave condensation- not really sure how they evporated
and took the water with them.
 
W

William Sommerwerck

Jan 1, 1970
0
Not all CFCs are equally effective at destroying ozone. Is it possible there
are still cleaners using these "less-effective" Freons?
 
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