On Thu, 27 Oct 2011 11:13:57 -0500, Jim Yanik
wrote:

"Arfa Daily" wrote in
:



"Jim Yanik" wrote in message
4...
"Arfa Daily" wrote in
:



"Jeff Layman" wrote in message
...
On 24/10/2011 13:33, Nomen Nescio wrote:
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.

--

Jeff

I'd go along with that. The stuff specified as 'electronics grade'
is typically at least 99.7% to get that rating

Arfa



the IPA commonly available at drug stores is usually 90-91%,I
believe,at least in the US.

--
Jim Yanik

Probably the same here, which is why you have to go to an electronic
parts supplier to get the electronics grade one

Arfa



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