DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ?????? 
Author Message
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

*******************************************************
1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
in the air of a colleague's workplace (ca. 20 square
meters), where he is working for 12 months now. No Lab
work has been done in this room since Dec 1992, so the
concentration may have been higher when he started.
However, 2 computers are operated in the room since '93.
*******************************************************
I'd like to know whether there is any danger associated
with this chemical, and what symptoms it may cause (if
any). Also, can anybody estimate its concentration one
year ago ?  
THANKS A LOT FOR YOUR REPLY !!!!
POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
*******************************************************

thank you for your attention,
  georg


The convex hull of all disclaimers made on usenet last year applies to this mess



Wed, 30 Oct 1996 04:36:29 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????
: *******************************************************
: 1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
: in the air of a colleague's workplace (ca. 20 square
: meters), where he is working for 12 months now. No Lab
: work has been done in this room since Dec 1992, so the
: concentration may have been higher when he started.
: However, 2 computers are operated in the room since '93.
: *******************************************************
: I'd like to know whether there is any danger associated
: with this chemical, and what symptoms it may cause (if
: any). Also, can anybody estimate its concentration one
: year ago ?  
: THANKS A LOT FOR YOUR REPLY !!!!
: POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
: *******************************************************

Basically there is no danger associated with such low levels of
halogenated flourocarbons. Flourocarbons are pretty much harmless until
they start to displace oxygen in a room, at which point they become a
simple asphyxiant. that's at about 100,000 ppm.

From the book, "Effects of Exposure to Toxic Gases", 2nd edition, 1977,
Matheson, the TLV for the most toxic of the flourocarbons,
dibromodifluoromethane, is 100 ppm. Since your CCl2F2 is at a level about 3
orders of magnitude lower, you have absolutely nothing to fear.

Mark Goldsworthy
HP - Santa Rosa



Wed, 30 Oct 1996 06:21:28 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

Quote:

>*******************************************************
>1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
>in the air of a colleague's workplace (ca. 20 square
>meters), where he is working for 12 months now. No Lab
>work has been done in this room since Dec 1992, so the
>concentration may have been higher when he started.
>However, 2 computers are operated in the room since '93.
>*******************************************************
>I'd like to know whether there is any danger associated
>with this chemical, and what symptoms it may cause (if
>any). Also, can anybody estimate its concentration one
>year ago ?  

According to the NIOSH Pocket Guide to Chemical Hazards,  (Public Health
Service, CDC, Nat'l Inst. for Occupational Safety and Health):

Trade names include Freon 12, Halon 122, Refrigerant 12
Exposure limits: 1000 ppm
Immed. Danger to Life and Health: 50,000 ppm (5% - at this concentration,
        it's displacing the air you need to breathe)

Since you're at roughly 1/1000th of the exposure limit, you're probably in
no danger.  It is extremely unlikely that your computers will emit Freon.

Places to look:
        - do the fire extinguishers in the room use Halon?
        - could Freon 12 be coming in from a leaky air-conditioning system?
        _ does your friend use a Freon-based air spray to remove dust from
                his/her computers.  Are other spray cans used in the area -
                do they use Freon 12/Propellant 12 as a spray propellant.

Hope this helps,

Bruce

--
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 \ The above does not represent OIT, UNC-CH, laUNChpad, or its other users. /
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Wed, 30 Oct 1996 22:07:29 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????


Fri, 19 Jun 1992 00:00:00 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

Quote:

>Subject: DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????
>Date: Fri, 13 May 1994 20:36:29 GMT
>*******************************************************
>1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
>in the air of a colleague's workplace (ca. 20 square
>meters), where he is working for 12 months now. No Lab
>work has been done in this room since Dec 1992, so the
>concentration may have been higher when he started.
>However, 2 computers are operated in the room since '93.
>*******************************************************
>I'd like to know whether there is any danger associated
>with this chemical, and what symptoms it may cause (if
>any). Also, can anybody estimate its concentration one
>year ago ?  
>THANKS A LOT FOR YOUR REPLY !!!!
>POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
>*******************************************************

High, Georg
This compound is chemically relatively inert and will probably give rise to
hemo-lysis. In addition, it is famous for its contribution to the
stratospheric ozone depletion. Also in this respect it should be considered to
be not wealthy.

Manuel



Sat, 02 Nov 1996 01:23:17 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????


Fri, 19 Jun 1992 00:00:00 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

   *******************************************************
   1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
   in the air of a colleague's workplace (ca. 20 square
   meters), where he is working for 12 months now. No Lab
   work has been done in this room since Dec 1992, so the
   concentration may have been higher when he started.
   However, 2 computers are operated in the room since '93.
   *******************************************************
   I'd like to know whether there is any danger associated
   with this chemical, and what symptoms it may cause (if
   any). Also, can anybody estimate its concentration one
   year ago ?  
   THANKS A LOT FOR YOUR REPLY !!!!
   POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
   *******************************************************

Just speaking as an engineer: I can't imagine there's much danger in
1.35 ppb of Freon.  Freon has been used for years as both a
refridgerant and solvent.  It's used alot for things like circuit
board testing and fabrication.  Of course, it wouldn't be the first
time we found a risk where none was envisioned.  The real risk we
know about is ozone depletion.

--

Disclaimer: Would you believe a disclaimer if I made one?



Sat, 02 Nov 1996 01:03:54 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????


Fri, 19 Jun 1992 00:00:00 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

Quote:

>Subject: DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????
>Date: Fri, 13 May 1994 20:36:29 GMT
>*******************************************************
>1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
>in the air of a colleague's workplace (ca. 20 square
>meters), where he is working for 12 months now. No Lab
>work has been done in this room since Dec 1992, so the
>concentration may have been higher when he started.
>However, 2 computers are operated in the room since '93.
>*******************************************************
>I'd like to know whether there is any danger associated
>with this chemical, and what symptoms it may cause (if
>any). Also, can anybody estimate its concentration one
>year ago ?  
>THANKS A LOT FOR YOUR REPLY !!!!
>POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
>*******************************************************

This is also used as "Halon(tm)" to put out fires in computer rooms. Sounds
like this place has had the Halon(tm) system dumped...I'd worry more about
the risk of fire than breathing the DiChloroDiFlouroMethane.  The only risk
I'm aware of is asphyxiation due to oxygen displacement from a system with
way too much halon(tm) for the size of the room.  Normally it's no problem
breathing the mix when it dumps.
--
David Tiller                | Network Administrator | Voice: (804) 752-3710   |

Brady Law critique removed  | P.O. Box 5005         | ICBM:  37d 42' 43.75" N |
due to liberal PC pressure. | Ashland, Va 23005     |        77d 31' 32.19" W |


Sun, 10 Nov 1996 01:36:57 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

Quote:

>>*******************************************************
>>1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
>This is also used as "Halon(tm)" to put out fires in computer rooms. Sounds
>like this place has had the Halon(tm) system dumped...I'd worry more about
>the risk of fire than breathing the DiChloroDiFlouroMethane.  The only risk
>I'm aware of is asphyxiation due to oxygen displacement from a system with
>way too much halon(tm) for the size of the room.  Normally it's no problem
>breathing the mix when it dumps.

Ignorance is so embarrasing.  This substance is the common everyday R-12
refrigerant used in automotive ACs, household refrigerators and the like.
It has absolutely nothing to do with Halon.  Halons are bromochloromethanes.
H-1211, for example, is CBrClF2.  (If you want to cure your ignorance
about Halon, I suggest you get a copy of NFPA-12A "Halon 1301 Fire
Extinguishing Systems".)

 A couple of parts per billion of R-12 might mean:

 *      Someone's car in the parking lot is leaking R-12
 *      The refrigerator in the lunchroom is leaking.
 *      Someone fired off an old R-12 propelled aerosol can.
 *      A large temperature inversion is in effect.

In other words, it ain't jack, to use scientific terms.  One can indefinitely
breath air containing several percent of R-12.

John

--

Performance Engineering Magazine.  Email to me published at my sole discretion
You know your country is dying when you have to make a distinction between
what is m{*filter*}and ethical and what is legal.



Tue, 12 Nov 1996 01:22:25 GMT
 DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????

Quote:

>Subject: DiCHLORO-diFLOURO-METHANE: HOW DANGEROUS ??????
>Date: Fri, 13 May 1994 20:36:29 GMT
>*******************************************************
>1.35 ppb DiCHLORO-diFLOURO-METHANE have been found
>in the air of a colleague's workplace (ca. 20 square
>meters), where he is working for 12 months now. No Lab
>work has been done in this room since Dec 1992, so the
>concentration may have been higher when he started.
>However, 2 computers are operated in the room since '93.
>*******************************************************
>I'd like to know whether there is any danger associated
>with this chemical, and what symptoms it may cause (if
>any). Also, can anybody estimate its concentration one
>year ago ?
>THANKS A LOT FOR YOUR REPLY !!!!
>POINTERS TO OTHER RESOURCES ARE WELCOME !!!!
>*******************************************************

From 29 CFR Part 1910.1000 (USA federal OHSA regulations):

The limitation on concentration in air for dichlorodiflouromethane
is 1000 ppm (time weighted average for an 8-hour period).
This is about 1 million times the concentration found in your
colleague's workplace.  He shouldn't worry about it.  

Another name for dichlorodiflouromethane is CFC-12.  It is a common
refrigerant and is being banned for its ozone depletion potential.
It is not a known carcinogen.

ann



Sun, 17 Nov 1996 02:21:47 GMT
 
 [ 11 post ] 

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