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2,2-Dichloro-1,1,1-trifluoroethane or HCFC-123 is considered as an alternative to CFC-11 in low pressure refrigeration and HVAC systems, and should not be used in foam blowing processes or solvent applications.

Skeletal formula of 2,2-dichloro-1,1,1-trifluoroethane
Space-filling model of the 2,2-dichloro-1,1,1-trifluoroethane molecule
IUPAC name
Other names
1,1,1-Trifluoro-2,2-dichloroethane, Dichlorotrifluoromethylmethane, Dichlorotrifluoroethane, Freon 123, HCFC-123, R-123
3D model (JSmol)
ECHA InfoCard 100.005.629
EC Number 206-190-3
RTECS number KI1108000
Molar mass 152.93 g·mol−1
Appearance Colorless liquid
Density 1.4638 g/cm3
Melting point −107 °C (−161 °F; 166 K)
Boiling point 27.82 °C (82.08 °F; 300.97 K)
Vapor pressure 89.3 kPa
NFPA 704
Flammability code 0: Will not burn. E.g. waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Its ozone depletion potential is ODP = 0.012, and global warming potential is GWP = 76. HCFC-123 will eventually be phased out under the current schedule of the Montreal Protocol, but can continue to be used in new HVAC equipment until 2020 in developed countries, and will still be produced for service use of HVAC equipment until 2030. Developing countries can use in new equipment until 2030, and can be produced for use in service until 2040.

HCFC-123 is used in large tonnage centrifugal chiller applications, and is the most efficient refrigerant currently in use in the marketplace for HVAC applications. HCFC-123 is also used as a testing agent for bypass leakage of carbon adsorbers in gas filtration systems, and as the primary chemical in Halotron I fire-extinguishing agent.[2]

Storage tanks carrying HCFC-123 should be a light grey.

Isomers are 1,2-dichloro-1,1,2-trifluoroethane (R-123a) with CAS 354-23-4 and 1,1-dichloro-1,2,2-trifluoroethane (R-123b) with CAS 812-04-4.


  1. ^ MSDS from DuPont
  2. ^ Halotron Emergency Safety Datasheet (PDF) (Technical report). Kidde Fire Systems. 2002. CAS-306-83-2.

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