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IUPAC name
Other names
Freon 142b; R-142b; HCFC-142b; Chlorodifluoroethane
3D model (JSmol)
ECHA InfoCard 100.000.811
Molar mass 100.49 g·mol−1
Appearance Colorless gas[1]
Melting point −130.8 °C (−203.4 °F; 142.3 K)[1]
Boiling point −9.6 °C (14.7 °F; 263.5 K)[1]
Main hazards Asphyxiant
632 °C (1,170 °F; 905 K)[1]
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

1-Chloro-1,1-difluoroethane (HCFC-142b, also known by trade names including Freon-142b) is a hydrochlorofluorocarbon (HCFC) with the chemical formula CH3CClF2. It is primarily used as a refrigerant.[2]

For the most part, concentrations of HCFCs in the atmosphere match the emission rates that are reported by industries. The exception to this is HCFC-142b which has a higher concentration than the emission rates suggest it should.[3] The Montreal Protocol calls for an end to the production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons(HCFCs) to mitigate the destruction of the stratospheric ozone layer.


HCFC-142b is used as a blowing agent for foam plastics production, as a refrigerant, and as feedstock to make polyvinylidene fluoride (PVDF).[4] It was mainly used to replace the CFCs that had been initially banned by the Montreal Protocol, but now HCFCs are also banned due to their ozone-depletion ability. The EPA states that CFCs and HCFCs can now only be used in processes that result in the transformation or destruction of the HCFCs, such as using HCFC-142b as feedstock to make PVDF.[5] They can also be used in equipment that was manufactured before January 1, 2010. The point of these new regulations is to phase-out HCFCs in much the same way that CFCs were phased out.

Production history[edit]

According to the Alternative Fluorocarbons Environmental Acceptability Study (AFEAS), in 2006 global production (excluding India and China who did not report production data) of HCFC-142b was 33,779 metric tons and an increase in production from 2006-2007 of 34%.[6]


  1. ^ a b c d e Record in the GESTIS Substance Database of the Institute for Occupational Safety and Health
  2. ^ "Safety Data Sheet for 1-Chloro-1,1-difluoroethane" (PDF). Retrieved 24 February 2018.
  3. ^ "Archived copy". Archived from the original on 2016-03-03. Retrieved 2018-02-13.
  4. ^ "Phaseout of Class II Ozone-Depleting Substances". Environmental Protection Agency.
  5. ^ U.S. Government Publishing Office Federal Register 2005 November 4, Protection of Stratospheric Ozone: Notice of Data Availability; Information Concerning the Current and Predicted Use of HCFC-22 and HCFC-142b Pages 67172 - 67174 [FR DOC # 05-22036].
  6. ^ "Archived copy". Archived from the original on 2015-09-28. Retrieved 2018-02-13.