Homebrew_PCBs

Explosions versus exposure ?    Both are potentially damaging.   Both warrant caution.

I think explosion can be prevented by keeping the volatile chemicals
in a sealed metal tin when not pouring them AND by checking  for any
potential spark source, as previously mentioned, before each and
every use.     This means powering off all heaters using fossil fuels and wireless equipment.   It also means humidifying the air during the heating season.

I already keep my cooking oils in a sealed metal tin except when pouring them into the skillet, to minimize risk of fire.

It is the longterm exposure that concerns me.    Accordingly, I will
ONLY use acetone/denatured alcohol outdoors until I talk to my sister.
(My sister has been a beautician for decades, and uses acetone daily in her work) or until I am convinced there is no risk to my body.   If I had
an integrated chemical fume hood/evacuator to suck fumes away from the worksite, I would not be so cautious.    But I do not.   So instead, I will use my screened-in porch.

I forgot to mention that denatured alcohol AKA methanol is a toxin.
Therefore, its vessel or any vessel containing it and something else,
acetone, for example, should be kept locked with a padlock and
isolated from the padlock's key when not in use.     In addition, any vessel containing any denatured alcohol should be labeled POISON.
And remember the label won't work on a curious 2-year-old.

AMEN!

On 2/2/2016 9:43:10 AM, rolohar@... [Homebrew_PCBs] <homebrew_pcbs@yahoogroups.com> wrote:

 

To All:

With "All Due Respect".............

Enough with the chemical horror stories.

Simply........If you have fear of using "Top Care" isopropyl alcohol (70% solution) or "Equate Beauty" ladies fingernail polish,which is actually 100% acetone, both obtainable at you local Walgreen's, Kmart or Walmart, then you should shun "Cold Transfer".

When I think of all the millions of people all over the world who use these items on a regular basis, I shudder at

the thought of all those who have been blinded, crippled and maimed, let alone all the many who have lost

their lives by coming in contact with these common, easily obtainable, inexpensive household items.

I guess that I am at serious risk when I drop an eyedropper full of a mixture of iso. and acet. on a piece of

copper clad epoxy-glass laminate and make a printed circuit board.

.Please..........Doomsday guys.............give it up!

Seriously,

Roland F. Harriston, P.D.

***************************

From: "'Tim Gibbs' timgibbs@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com>
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, February 2, 2016 7:38:25 AM
Subject: [Homebrew_PCBs] Re: Danger of Chemical Exposure.

 

I must echo the views of dangerous chemicals. A school friend was working on cleaning his motor bike engine. He was using a mixture of acetone, white spirit and trichloro??? . His father was using a grinder about 25 -30 feet away in the same garage. All of a sudden my friends overalls caught fire from the exposed splashed on chemicals. His hands were the worst burnt as he tried to take his burning overalls off. 18 months in hospital, 2 to 3 years of occupational therapy. 5 years before he was able to have assisted work. He needs repeated surgery as the scars on his hands shrank. The burning pants and underpants destroyed any chance of sex again, all gone or scar tissue.

 

I do use some of the above chemicals but made myself a fume cupboard/ paint spray booth and have a couple of fans to draw the fumes through to an outside widow and roof vent. I also have a small fire extinguisher in my work area (I do white metal casting as well) and under the kitchen sink. Never used them, except when they have date expired and have been replaced. A couple of times I started a fire in the backyard or BBQ and put it out with the out of date expired extinguisher. A useful learning experience.

 

 

I am a dentist and have work made form me by dental technicians. Many of the chemical the dental technicians use are nasty. I am aware that most of the dental technicians I used to know have died in their middle years and looked older than they should. I wondered if this was continual exposure to chemicals. I was visiting one dental laboratory where the fumes were overpowering and left the room almost immediately. There were 5 technicians in the room all day at the time. Only technician was older than me at the time. I know that at least 3 of them have died and the female never carried a child to term. This was 25 to 30 years ago.

 

 

The chemicals are useful but please treat them respect or use alternatives.

 

Tim Gibbs

Not quite:


Denatured alcohol

From Wikipedia, the free encyclopedia

*Denatured alcohol*, also called *methylated spirits*, is ethanol
<https://en.wikipedia.org/wiki/Ethanol> that has additives to make it
poisonous <https://en.wikipedia.org/wiki/Poisonous>, somewhat bad
tasting, foul smelling or nauseating
<https://en.wikipedia.org/wiki/Emetic>, to discourage recreational
consumption. In some cases it is also dyed.

/BrovoPapa/

------------------------------------------------------------------------
alan00463@... [Homebrew_PCBs] wrote:

>
>
> I forgot to mention that denatured alcohol AKA methanol is a toxin.
> Therefore, its vessel or any vessel containing it and something else,
> acetone, for example, should be kept locked with a padlock and
> isolated from the padlock's key when not in use. In addition, any
> vessel containing any denatured alcohol should be labeled POISON.
> And remember the label won't work on a curious 2-year-old.
>
>

I would not trust wikipedia for anything related to my own life.

If you want reliable data, searcher "MSDS Acetone” from a reputable website.
One I used is http://physics.utsa.edu/memslab/MSDS/Acetone.pdf

Just my $0.02,
Jean-Paul
N1JPL

> On Feb 2, 2016, at 2:54 PM, Priyank Garg priyankgarg28@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
>
>
> Hi all,
>
> Please read the wikipedia article on acetone. It is only slightly toxic (even produced in our body) and has very high ignition initiation energy( so rarely cause accidental ignition)
>
> On 3 February 2016 at 00:56, camillus camillus_blockx@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com>wrote:
>
> AMEN!
>
>
>> On 2/2/2016 9:43:10 AM, rolohar@... [Homebrew_PCBs] <homebrew_pcbs@yahoogroups.com> wrote:
>>
>>
>>
>> To All:
>>
>> With "All Due Respect".............
>>
>> Enough with the chemical horror stories.
>>
>> Simply........If you have fear of using "Top Care" isopropyl alcohol (70% solution) or "Equate Beauty" ladies fingernail polish,which is actually 100% acetone, both obtainable at you local Walgreen's, Kmart or Walmart, then you should shun "Cold Transfer".
>>
>> When I think of all the millions of people all over the world who use these items on a regular basis, I shudder at
>> the thought of all those who have been blinded, crippled and maimed, let alone all the many who have lost
>> their lives by coming in contact with these common, easily obtainable, inexpensive household items.
>>
>> I guess that I am at serious risk when I drop an eyedropper full of a mixture of iso. and acet. on a piece of
>> copper clad epoxy-glass laminate and make a printed circuit board.
>>
>> .Please..........Doomsday guys.............give it up!
>>
>> Seriously,
>>
>> Roland F. Harriston, P.D.
>> ***************************
>>
>> From: "'Tim Gibbs' timgibbs@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com>
>> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
>> Sent: Tuesday, February 2, 2016 7:38:25 AM
>> Subject: [Homebrew_PCBs] Re: Danger of Chemical Exposure.
>>
>>
>>
>>
>> I must echo the views of dangerous chemicals. A school friend was working on cleaning his motor bike engine. He was using a mixture of acetone, white spirit and trichloro??? . His father was using a grinder about 25 -30 feet away in the same garage. All of a sudden my friends overalls caught fire from the exposed splashed on chemicals. His hands were the worst burnt as he tried to take his burning overalls off. 18 months in hospital, 2 to 3 years of occupational therapy. 5 years before he was able to have assisted work. He needs repeated surgery as the scars on his hands shrank. The burning pants and underpants destroyed any chance of sex again, all gone or scar tissue.
>>
>>
>> I do use some of the above chemicals but made myself a fume cupboard/ paint spray booth and have a couple of fans to draw the fumes through to an outside widow and roof vent. I also have a small fire extinguisher in my work area (I do white metal casting as well) and under the kitchen sink. Never used them, except when they have date expired and have been replaced. A couple of times I started a fire in the backyard or BBQ and put it out with the out of date expired extinguisher. A useful learning experience.
>>
>>
>>
>> I am a dentist and have work made form me by dental technicians. Many of the chemical the dental technicians use are nasty. I am aware that most of the dental technicians I used to know have died in their middle years and looked older than they should. I wondered if this was continual exposure to chemicals. I was visiting one dental laboratory where the fumes were overpowering and left the room almost immediately. There were 5 technicians in the room all day at the time. Only technician was older than me at the time. I know that at least 3 of them have died and the female never carried a child to term. This was 25 to 30 years ago.
>>
>>
>>
>> The chemicals are useful but please treat them respect or use alternatives.
>>
>>
>> Tim Gibbs
>>
>>
>>
>>
>>
>
>
>
>

When I talked to here about acetone in the workplace, my sister the beautician said that

1.    She knew of no adverse health effects from breathing it at the
salon for years, at low concentrations.
2.   No ventilation of its fumes was done at her workplace.
3.   The only workplace precaution regarding acetone was that NOT
       more than one gallon of it was allowed to be in the salon at a time.

Hence, I will not hesitate to experiment using the acetone/methanol mixture indoors w/ closed windows.    However, I will first get a sealed tin to store the flammable chemicals in when not in use, and a pair of chemical safety goggles.

+ a fireproof blanket!
Jean-Claude

 

When I talked to here about acetone in the workplace, my sister the beautician said that

1.    She knew of no adverse health effects from breathing it at the
salon for years, at low concentrations.
2.   No ventilation of its fumes was done at her workplace.
3.   The only workplace precaution regarding acetone was that NOT
       more than one gallon of it was allowed to be in the salon at a time.

Hence, I will not hesitate to experiment using the acetone/methanol mixture indoors w/ closed windows.    However, I will first get a sealed tin to store the flammable chemicals in when not in use, and a pair of chemical safety goggles.

Acetone may not be that bad, I have heard that from other sources.

Methanol is a real hazard to breath or for skin uptake, or so I was trained a long time ago. I would look into it further before I assumed a clean bill of health for Methyl Hydrate, if I was you. YMMV, and as I said, the training on which I base the comment is not recent.

Adam

 

When I talked to here about acetone in the workplace, my sister the beautician said that

1.    She knew of no adverse health effects from breathing it at the
salon for years, at low concentrations.
2.   No ventilation of its fumes was done at her workplace.
3.   The only workplace precaution regarding acetone was that NOT
       more than one gallon of it was allowed to be in the salon at a time.

Hence, I will not hesitate to experiment using the acetone/methanol mixture indoors w/ closed windows.    However, I will first get a sealed tin to store the flammable chemicals in when not in use, and a pair of chemical safety goggles.

-- 


Adam Smith
705-534-6288
705-427-5038

For anyone interested in relatively 'hard' information, here's a link to CDC's toxicological profile for acetone:
http://www.atsdr.cdc.gov/toxprofiles/tp21.pdf

TL;DR:  It can be toxic, generally, but whether you'll experience any effects following exposure depends on how much you use, how often you use it, the type/route of exposure (e.g., inhalation, dermal, oral), the environment you use it in, and your level of internal toxicity/state of health/etc.  In short, it's no different than anything else.

Brian

 

When I talked to here about acetone in the workplace, my sister the beautician said that

1.    She knew of no adverse health effects from breathing it at the
salon for years, at low concentrations.
2.   No ventilation of its fumes was done at her workplace.
3.   The only workplace precaution regarding acetone was that NOT
       more than one gallon of it was allowed to be in the salon at a time.

Hence, I will not hesitate to experiment using the acetone/methanol mixture indoors w/ closed windows.    However, I will first get a sealed tin to store the flammable chemicals in when not in use, and a pair of chemical safety goggles.

-- 
Brian W. Gortney, II
Ph:  850.549.2289
Fax:  866.675.0301
bwg@...
http://www.briangortney.com


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To each his own I suppose:
I worked @ a Methanol manufacturing facility. I know the dangers better
than a beautician.
http://toxtown.nlm.nih.gov/text_version/chemicals.php?id=77

The methanol in denatured alcohol sold under the Klean-Strip S-L-X name "Thins shellac, cleans glass and metal. Clean-burning fuel for marine stoves."

The MSDS says it is 45-50% Ethyl alcohol, 40-50% Methanol, and 0-5% Methyl isobutyl ketone.

Backpackers use it:
"Zen and the Art of the Alcohol Stove"

The CDC reports NIOSH and OSHA exposure limits for methanol of 400 ppm, ethanol of 1,000 ppm and isopropanol of 200 ppm.

Sterno has apparently moved away from denatured alcohol for their fuel products to a "Green" series,which is ethanol-based.

Ted, KX4OM