FACTOID # 30: If Alaska were its own country, it would be the 26th largest in total area, slightly larger than Iran.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Freon" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Freon

Freon is a trade name for a group of chlorofluorocarbons used primarily as a refrigerant. The word Freon is a registered trademark belonging to DuPont. Prior to their implication as a major contributor to ozone depletion (and a minor contributor to the greenhouse effect), freons were also used as aerosol propellants and to foam up polymer materials.


Freon was developed as a safer alternative to toxic gases such as, ammonia (NH3), methyl chloride (CH3Cl), and sulfur dioxide (SO2), that were used as refrigerants prior to the discovery of freon. Despite the controversy, R12 works well and is very safe. Its inventor, Thomas Midgley, actually breathed in a lungful and exhaled over a candle to demonstrate its nontoxicity and nonflammability.


Before CFCs were banned by developed nations, a 12 ounce (340 g) can of freon (R12) cost about $1; following the ban the cost of freon rose dramatically. People now go through considerable trouble to recycle freon from existing sources. As of 2002, freon cost about $85 per lb ($187 per kg). Freon is most frequently sold in 12 ounce (340 g) cans and 30 pound (13.6 kg) canisters.

Image:freon12_suva134a.png

Freon 12 (also known as R-12) was a popular refrigerant before it was banned. The chemical formula is CCl2F2 and its proper chemical name is dichlorodifluoromethane. When people refer to freon without specifying a number, it is likely that they mean freon-12.


Suva 134a (also known as R-134 or R-134a) is the most common replacement for R-12. Unlike R-12, which is a chlorofluorcarbon, R-134 is a hydrofluorocarbon. The chemical formula is CH2FCF3 and the proper chemical name 1,1,1,2-tetrafluoroethane.

Freon 41 fluoromethane
R-11 CFC-11 trichlorofluoromethane
R-12 CFC-12 dichlorodifluoromethane
R-13 CFC-13 chlorotrifluoromethane
R-22 HCFC-22 chlorodifluoromethane
R-23 HFC-23 trifluoromethane
R-113 CFC-113 trichlorotrifluoroethane
R-114 CFC-114 1,2-dichloro-1,1,2,2-tetrafluoroethane
R-115 CFC-115 1-chloro-1,1,2,2,2-pentafluoroethane
R-116 CFC-116 hexachloroethane
R-134a HFC-134a 1,1,1,2-tetrafluoroethane
R-227ea HFC-227ea 1,1,1,2,3,3,3-heptafluoropropane

Freon in copper tubing open to the environment can turn into phosgene gas after coming in contact with extreme heat, such as, while brazing or in a fire situation. Phosgene is a substance that was used as a chemical weapon in World War I. Low exposure can cause irritation, but high levels cause fluid to collect in the lungs, possibly resulting in fatality.


See also: Halon


  Results from FactBites:
 
Haloalkane - Wikipedia, the free encyclopedia (3244 words)
Freon is a trade name for a group of chlorofluorocarbons used primarily as a refrigerant.
There is concern that halons are being broken down in the atmosphere to bromine, which reacts with ozone, leading to depletion of the ozone layer (this is similar to the case of chlorofluorocarbons such as freon).
Freon in copper tubing open to the environment can turn into phosgene gas after coming in contact with extreme heat, such as while brazing or in a fire situation.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m