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Old 2nd March 2009, 06:49 PM   #11
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Quote:
Originally posted by boywonder


We had those in the 80's when I worked in the aerospace industry, and they cleaned nasty looking PCB's in no time, but probably blew a big hole in the ozone layer above the plant where I worked.


The real industry degreaser was a triclorethylene bath (now banned) and it stripped anything organic. And yes it did blow a hole in the ozone layer. If one smoked in presence of the fumes (which in some places was quite common) and inhaled, it formed phosphene. So much for Health & Safety from 1950,60'70'80' never really woke up to this danger.

Acetone can be used on pcb but often leaves a residue and will dissolve certain plastics. Don't use it on polystyrene caps !!!

richy
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Old 2nd March 2009, 09:45 PM   #12
nhuwar is offline nhuwar  United States
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I use methanol, toluene and acetone as my major cleaners. I has some special industrial 3m stuff that works amazingly well but I don't recall the name right now.


Nick
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Old 3rd March 2009, 02:49 AM   #13
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Default Re: Thanks Carlos!

Quote:
Originally posted by grhughes
What kind of air pistol (brand) do you use?
Hi Ray ,

Nothing special at all !!! A common painting air pistol for
domestic jobs purpose , works very well .

The secret is to adjust the spray jet for a consistent amount
of isopropanol being sprayed out , and the 120 psi of air
preassure , will do the rest of the job .

As I had said , you can aid the cleanness with a paint brush ,
it is very useful .

Do not waste the alcohol , that is being sprayed out , you can
recicle the liquid , filter it ( use a paper filter ) , and use it again
until you see that it is dirt saturated .

In my experience , you will spent aprox . 2.5 2.7 liters ( 3 / 4
Gallon ) of isopropanol , to clean all the 6 PC boards .

Regards ,

Carlos
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Old 3rd March 2009, 03:36 AM   #14
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Quote:
Originally posted by AuroraB
I once read about a guy who stuffed the whole guitar amp chassis in the dish washer!
Hi AuroraB ,

I do not recommend to do that , because the special soap , used
in dish washers , has a extremely high amount of Sodium Sulfonate , that strongly attacks the lead and the tin on solder joints .
Instead , you can use pure water and a neutral soap , and dry all the stuff , very , very well , BUT the cleanness will not be so good
as that made with isopropanol .


Quote:
Originally posted by richwalters

Acetone can be used on pcb but often leaves a residue and will dissolve certain plastics. Don't use it on polystyrene caps !!!
Hi Richy ,

Totally correct !! But the acetone vapor is very intoxicating and
highly flammable .


Quote:
Originally posted by nhuwar
I use methanol, toluene and acetone as my major cleaners.
Hi Nick ,

Sorry to say that , but I can not believe in it . All the three liquids
are VERY , VERY INTOXICATING and can cause irreparable
damages to your health .
Please be very careful to handle with them and use the proper
protection , on nose , mouth , eyes and hands .
Methanol and Acetone are highly flammable .
Unless you are an experienced chemist .


In time : The Isopropylic Alcohol is very flammable too ,
but not so much like acetone and methanol

Regards for all ,

Carlos
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Old 3rd March 2009, 03:20 PM   #15
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by refference


Hi AuroraB ,

I do not recommend to do that , because the special soap , used
in dish washers , has a extremely high amount of Sodium Sulfonate , that strongly attacks the lead and the tin on solder joints .
Instead , you can use pure water and a neutral soap , and dry all the stuff , very , very well , BUT the cleanness will not be so good
as that made with isopropanol .




Hi Richy ,

Totally correct !! But the acetone vapor is very intoxicating and
highly flammable .




Hi Nick ,

Sorry to say that , but I can not believe in it . All the three liquids
are VERY , VERY INTOXICATING and can cause irreparable
damages to your health .
Please be very careful to handle with them and use the proper
protection , on nose , mouth , eyes and hands .
Methanol and Acetone are highly flammable .
Unless you are an experienced chemist .


In time : The Isopropylic Alcohol is very flammable too ,
but not so much like acetone and methanol

Regards for all ,

Carlos
They aren't that bad if you know what you are doing with them. I work with many chemical much more toxic and dangerous then them. I have been working in chemical labs for over 10 years.
These 3 chemicals all have special purposes.

I to also think trichloroethane is a very good cleaner and it is not illegal in the US, you can still get it. The good thing about it is it is not flammable.

If you really want to stick with a friendly volatile use propanol, is pure isopropyl.

There are far worst cleaners and solvents then the ones I have mentioned.

Nick


Nick
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Old 4th March 2009, 03:40 AM   #16
m12ax7 is offline m12ax7  United States
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In the "good old days" one could dip electronics in Carbon tetrachloride.

It was a great cleaner if you could get past the damage to your health.

Now that I give it some thought, I recall it was pretty nasty on some plastics.

As a kid we put it in squirt guns and killed bees. Until the guns melted in our hands.
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Old 4th March 2009, 09:36 PM   #17
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Quote:
Originally posted by nhuwar

I have been working in chemical labs for over 10 years.
Hi Nick ,

OK !! I am relieved now . As I had said , if you are
an experienced chemist , no problem at all .

Regards ,

Carlos
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Old 5th March 2009, 03:30 PM   #18
nhuwar is offline nhuwar  United States
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You know I wonder how the new stuff r134a would work?


Just a thought.




Nick
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Old 5th March 2009, 03:55 PM   #19
kuroguy is offline kuroguy  United States
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R134a boils at -16 degrees F. It would simply boil off at atmospheric pressure and likely freeze whatever it came in contact with (like your skin).
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Old 6th March 2009, 02:53 AM   #20
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by kuroguy
R134a boils at -16 degrees F. It would simply boil off at atmospheric pressure and likely freeze whatever it came in contact with (like your skin).

I know, but the original freon worked very well as a de greaser. I wonder how 134a would do.

Oh and that 3m cleaner I was talking about before wasn't made by 3m. The stuff is called Vertrel XM and it's made by Dupont. It's supposed to have 0 negative environmental impact.

But I can't say how it works since I haven't tried what I have yet. It's supposed to be the Jim Dandy though so I need to give it a whirls soon. It's I'm and alcoholic when it comes to solvents LOL.



Nick
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