Dichlorodifluoromethane

Dichlorodifluoromethane (R-12) is a colorless gas usually sold under the brand name Freon-12, and a chlorofluorocarbon halomethane (CFC) used as a refrigerant and aerosol spray propellant. In compliance with the Montreal Protocol, its manufacture was banned in developed countries (non-article 5 countries) in 1996, and in developing countries (Article 5 countries) in 2010 out of concerns about its damaging effect on the ozone layer. Its only allowed usage is as a fire retardant in submarines and aircraft. It is soluble in many organic solvents. R-12 cylinders are colored white.

Dichlorodifluoromethane
Names
Preferred IUPAC name
Dichlorodi(fluoro)methane
Other names
  • Dichlorodifluoromethane
  • Carbon dichloride difluoride
  • Dichloro-difluoro-methane
  • Difluorodichloromethane
  • Freon 12
  • R-12
  • CFC-12
  • P-12
  • Propellant 12
  • Halon 122
  • Arcton 6
  • Arcton 12
  • E940
  • Fluorocarbon 12
  • Genetron 12
  • Refrigerant 12
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.813
EC Number
  • 200-893-9
E number E940 (glazing agents, ...)
KEGG
PubChem CID
RTECS number
  • PA8200000
UNII
UN number 1028
  • InChI=1S/CCl2F2/c2-1(3,4)5 Y
    Key: PXBRQCKWGAHEHS-UHFFFAOYSA-N Y
  • InChI=1/CCl2F2/c2-1(3,4)5
    Key: PXBRQCKWGAHEHS-UHFFFAOYAX
SMILES
  • ClC(Cl)(F)F
Properties
CCl2F2
Molar mass 120.91 g·mol−1
Appearance Colorless gas
Odor ether-like at very high concentrations
Density 1.486 g/cm3 (−29.8 °C (−21.6 °F))
Melting point −157.7 °C (−251.9 °F; 115.5 K)
Boiling point −29.8 °C (−21.6 °F; 243.3 K)
0.286 g/L at 20 °C (68 °F)
Solubility in alcohol, ether, benzene, acetic acid Soluble
log P 2.16
Vapor pressure 568 kPa (20 °C (68 °F))
0.0025 mol kg−1 bar−1
Magnetic susceptibility (χ)
 −52.2·10−6 cm3/mol
Thermal conductivity 0.0097 W/(m·K) (300 K)
Structure
Molecular shape
 Tetrahedral
0.51 D
Hazards
GHS labelling:
Warning
H280, H336, H420
P261, P271, P304+P340, P319, P403+P233, P405, P410+P403, P501, P502
NFPA 704 (fire diamond)
0
0
0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
LC50 (median concentration)
 760,000 ppm (mouse, 30 min)
800,000 ppm (rabbit, 30 min)
800,000 ppm (guinea pig, 30 min)
600,000 ppm (rat, 2 h)
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1000 ppm (4950 mg/m3)
REL (Recommended)
 TWA 1000 ppm (4950 mg/m3)
IDLH (Immediate danger)
 15000 ppm
Supplementary data page
Dichlorodifluoromethane (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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