Have I got the correct Isopropyl Alcohol

Z

Z

Guest
I have cleaned up a PCB board with Isopropyl alcohol and it has left
terrible amount of residue on the board white chalky/powdery deposits) a
problem I have not had with Isopropyl before.
The drum (5litres) is marked:
Isopropanol
UN NO:1219
EC 200-661-7

It has been in proper storage and not been infiltrated with anything
else since I got it.
Have I got the right stuff? Is this de-natured?
How can I test it? What specific gravity should I read?

Also out of curiosity what is Isopropyl alcohol distilled from.
--
Z
Remove all Zeds in e-mail address to reply.
 
I have cleaned up a PCB board with Isopropyl alcohol and it has left
terrible amount of residue on the board white chalky/powdery deposits)
Click to expand...
Some alcohols can do this on circuit boards. I think it may be interacting
with the flux that is applied on many circuit boards.

This shouldn't be harmful. Just clean it off.

Have I got the right stuff?
Click to expand...
Should be, as long as it doesn't contain anything but the solvent in question,
maybe low amounts of other kinds of solvents, and maybe a percentage of water.

Is this de-natured?
Click to expand...
No. Denatured alcohol is pure ethyl alcohol (moonshine) that is mixed with
various compounds, such as acetone and methanol, to denature it and make it
poisonous. This way, hardware stores can sell this alcohol without a liquor
license as you cannot drink denatured alcohol without being harmed by it and
there is no way to reverse the mixture to make it consumable. It's used as a
solvent, a thinner, and as fuel for alcohol stoves. I use this stuff to clean
up circuit boards and tape paths on magnetic tape equipment.

Also out of curiosity what is Isopropyl alcohol distilled from.
Click to expand...
Isopropyl alcohol, a.k.a. isopropanol, is not derived from grain and wood
sources. Rather, it is a byproduct of petroleum refinement. The propylene gas
that results from the petroleum refinement is dissolved using sulfuric acid and
the resulting sulfate ester is hydrolized to create isopropyl alcohol. It has
three carbons. - Reinhart
 
This way, hardware stores can sell this
alcohol without a liquor license as you cannot drink denatured alcohol
without being harmed by it and there is no way to reverse the mixture
to make it consumable.
Click to expand...
It can't be re-distilled or something?
 
On Sun, 16 May 2004 04:25:59 GMT, Steve Kraus
<screen@SPAMBLOCKfilmteknik.com> wrote:

This way, hardware stores can sell this
alcohol without a liquor license as you cannot drink denatured alcohol
without being harmed by it and there is no way to reverse the mixture
to make it consumable.

It can't be re-distilled or something?
Click to expand...
Correct, the boiling points of these nasties along with the "good
stuff" are overlap on each other for that reason.
 
Correct, the boiling points of these nasties along with the "good
stuff" are overlap on each other for that reason.
Click to expand...
Which means the bad stuff will simply evaporate with the good stuff at about
the same time and will all condense together at the other end of the still,
which means that hardly anything in denatured alcohol is separated when
distilled so it still retains all of its toxicity. - Reinhart
 
Wow -- you guys are *way* too knowledgeable on this subject. If I didn't
know better, I'd say we were all back in highschool. <g>

Dave

"LASERandDVDfan" <laseranddvdfan@aol.com> wrote in message
news:20040516014512.19889.00001467@mb-m10.aol.com...
Correct, the boiling points of these nasties along with the "good
stuff" are overlap on each other for that reason.

Which means the bad stuff will simply evaporate with the good stuff at
about
the same time and will all condense together at the other end of the
still,
which means that hardly anything in denatured alcohol is separated when
distilled so it still retains all of its toxicity. - Reinhart
Click to expand...
 
This sounds like the residue from the flux on the board. It is harmless.
This can be cleaned off.

--

Jerry G.
=====


"Z" <post@imaris.demon.co.uk> wrote in message
news:TSq2yYshRqpAFwwu@imaris.demon.co.uk...
I have cleaned up a PCB board with Isopropyl alcohol and it has left
terrible amount of residue on the board white chalky/powdery deposits) a
problem I have not had with Isopropyl before.
The drum (5litres) is marked:
Isopropanol
UN NO:1219
EC 200-661-7

It has been in proper storage and not been infiltrated with anything
else since I got it.
Have I got the right stuff? Is this de-natured?
How can I test it? What specific gravity should I read?

Also out of curiosity what is Isopropyl alcohol distilled from.
--
Z
Remove all Zeds in e-mail address to reply.
 
In article <20040515212135.08632.00001308@mb-m11.aol.com>,
LASERandDVDfan <laseranddvdfan@aol.com> writes
I have cleaned up a PCB board with Isopropyl alcohol and it has left
terrible amount of residue on the board white chalky/powdery deposits)

Some alcohols can do this on circuit boards. I think it may be interacting
with the flux that is applied on many circuit boards.

This shouldn't be harmful. Just clean it off.

Have I got the right stuff?

Should be, as long as it doesn't contain anything but the solvent in question,
maybe low amounts of other kinds of solvents, and maybe a percentage of water.

Is this de-natured?

No. Denatured alcohol is pure ethyl alcohol (moonshine) that is mixed with
various compounds, such as acetone and methanol, to denature it and make it
poisonous. This way, hardware stores can sell this alcohol without a liquor
license as you cannot drink denatured alcohol without being harmed by it and
there is no way to reverse the mixture to make it consumable. It's used as a
solvent, a thinner, and as fuel for alcohol stoves. I use this stuff to clean
up circuit boards and tape paths on magnetic tape equipment.
Click to expand...
Is that cheaper or better than Isopropyl alcohol. Is it easy to distil?
Also out of curiosity what is Isopropyl alcohol distilled from.

Isopropyl alcohol, a.k.a. isopropanol, is not derived from grain and wood
sources. Rather, it is a byproduct of petroleum refinement. The propylene gas
that results from the petroleum refinement is dissolved using sulfuric acid and
the resulting sulfate ester is hydrolized to create isopropyl alcohol. It has
three carbons. - Reinhart
Click to expand...
It sounds a little complex to home-brew then, not that I'd try it with
distilling being illegal without a licence.
--
Z
Remove all Zeds in e-mail address to reply.
 
On Sun, 16 May 2004 05:57:29 GMT, Dave hath writ:
Wow -- you guys are *way* too knowledgeable on this subject. If I didn't
know better, I'd say we were all back in highschool. <g
Click to expand...
Or, the Navy.
 
It sounds a little complex to home-brew then, not that I'd try it with
distilling being illegal without a licence.
Click to expand...
Yeah. Isopropanol has a benefit, though. It's relatively cheap, is just as
effective a solvent as ethanol (as long as it isn't dilluted), and is excellent
for medical sterilization, although prolonged exposure to any strong alcoholic
substance can be hazardous.

As for drinking, only ethanol can be consumed to a point. Isopropanol and
methanol are highly poisonous at low doses. Isopropanol is bad because it
breaks down into a cumulative poison while methanol is oxidized into
formaldehyde in the liver.

Interestingly enough, the antidote for methanol poisoning are alcoholic
beverages, particularly hard liquor. So, if you accidentally drink wood-based
alcohols, break out the Jack Daniels. (Seriously, go to a hospital!)

And these are only a fraction of the kinds of alcohols that exist in the world
today. - Reinhart
 
Right... the Navy.... during WW2 my dad was in the submarine service as a
topedo man....... he had stories of them drinking the alcohol fuel for the
torpedos.... and sometimes going blind or getting very sick.
---------------------


"Allodoxaphobia" <bit-bucket@config.com> wrote in message
news:slrncafb9m.j2p.bit-bucket@localhost.config.com...
On Sun, 16 May 2004 05:57:29 GMT, Dave hath writ:
Wow -- you guys are *way* too knowledgeable on this subject. If I
didn't
know better, I'd say we were all back in highschool. <g

Or, the Navy.
Click to expand...
 
On 16 May 2004 01:21:35 GMT, laseranddvdfan@aol.com (LASERandDVDfan)
wrote:

I have cleaned up a PCB board with Isopropyl alcohol and it has left
terrible amount of residue on the board white chalky/powdery deposits)

Some alcohols can do this on circuit boards. I think it may be interacting
with the flux that is applied on many circuit boards.

This shouldn't be harmful. Just clean it off.

Have I got the right stuff?

Should be, as long as it doesn't contain anything but the solvent in question,
maybe low amounts of other kinds of solvents, and maybe a percentage of water.

Is this de-natured?

No. Denatured alcohol is pure ethyl alcohol (moonshine) that is mixed with
various compounds, such as acetone and methanol, to denature it and make it
poisonous. This way, hardware stores can sell this alcohol without a liquor
license as you cannot drink denatured alcohol without being harmed by it and
there is no way to reverse the mixture to make it consumable. It's used as a
solvent, a thinner, and as fuel for alcohol stoves. I use this stuff to clean
up circuit boards and tape paths on magnetic tape equipment.

Also out of curiosity what is Isopropyl alcohol distilled from.

Isopropyl alcohol, a.k.a. isopropanol, is not derived from grain and wood
sources. Rather, it is a byproduct of petroleum refinement. The propylene gas
that results from the petroleum refinement is dissolved using sulfuric acid and
the resulting sulfate ester is hydrolized to create isopropyl alcohol. It has
three carbons. - Reinhart
Click to expand...

Isn't propylene gas sold under the name Mapp gas?
 
Right... the Navy.... during WW2 my dad was in the submarine service as a
topedo man....... he had stories of them drinking the alcohol fuel for the
torpedos.... and sometimes going blind or getting very sick.
Click to expand...
Which would indicate that the alcohols were methyl-based. - Reinhart
 
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