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"R-143a" redirects here. For the road, see Route 143.
IUPAC name
Other names
Methylfluoroform, 1,1,1-Trifluoroform, R-143a, HFC-143a, UN 2035
420-46-2 YesY
ChemSpider 9484 YesY
EC number 206-996-5
Jmol-3D images Image
PubChem 9868
Molar mass 84.04 g/mol
Appearance Colourless gas
Density 3.7 kg/m3 (gas)
Melting point −111 °C (−168 °F; 162 K)
Boiling point −47.6 °C (−53.7 °F; 225.6 K)
Vapor pressure 11 200 hPa (20 °C)
EU classification Extremely flammable (F+)
R-phrases R12
S-phrases S9, S16, S33
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 YesY verify (what isYesY/N?)
Infobox references

1,1,1-Trifluoroethane, or R-143a or simply trifluoroethane, is a fluorocarbon compound that is a clear, colorless gas. It should not be confused with the isomeric compound 1,1,2-trifluoroethane.

It has a critical temperature of 73 °C.

It is used as a refrigerant either by itself or more commonly as a component of blended mixtures. Unlike CFCs used as refrigerants, trifluoroethane has no chlorine atoms and is therefore not an ozone-depleting chemical, though its high chemical stability and infra-red absorbency make it a potent greenhouse gas.

Trifluoroethane is also used as a propellant in canned air products used to clean electronic equipment.


  1. MSDS for 1,1,1-trifluoroethane