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Structural formula of octafluoropropane
Ball-and-stick model of octafluoropropane
IUPAC name
Other names
Freon 218
RC 218, PFC 218
Flutec PP30
genetron 218
76-19-7 YesY
ChemSpider 6192 YesY
DrugBank DB00556 N
ECHA InfoCard 100.000.857
Jmol 3D model Interactive image
KEGG D01738 YesY
PubChem 6432
RTECS number TZ5255000
Molar mass 188.02 g/mol
Appearance Colorless gas with
faintly sweet odor
Density 8.17 g/l, gas
Melting point −183 °C (−297.4 °F; 90.1 K)
Boiling point −36.7 °C (−34.1 °F; 236.5 K)
0.014 D
Main hazards Suffocation
Safety data sheet See: data page
R/S statement R: ?
S: ?
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point N/A
Related compounds
Related halocarbons
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Octafluoropropane (C3F8) is a fluorocarbon non-flammable greenhouse gas that can be produced either by electrochemical fluorination or by the Fowler process using cobalt fluoride.[1]


In the electronics industry, octafluoropropane is mixed with oxygen and used as a plasma etching material for SiO2 layers in semiconductor applications, as oxides are selectively etched versus their metal substrates.[2]

In medicine, octafluoropropane may compose the gas cores of microbubble contrast agents used in contrast-enhanced ultrasound. Octafluoropropane microbubbles reflects sound waves well and are used to improve the ultrasound signal backscatter. It is also used in pars plana vitrectomy procedures where a retina hole or tear is repaired. The gas acts to provide a long-term tamponade, or plug, of a retinal hole/tear and allows re-attachment of the retina to occur over the following several days post-op.

Under the name R-218, octafluoropropane is used in other industries as a component of refrigeration mixtures.

It has featured in some plans for terraforming Mars.[3]

It is the active liquid in PICO-2L dark matter bubble detector (joined PICASSO and COUPP collaborations).

Liquid phase[edit]

  • Liquid density (1.013 bar at boiling point) : 1601 kg/m3
  • Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) : 196 vol/vol
  • Latent heat of vaporization (1.013 bar at boiling point) : 104.25 kJ/kg [4]

Gaseous phase[edit]

  • Gas density (1.013 bar at boiling point) : 10.3 kg/m3
  • Gas density (1.013 bar and 15 °C (59 °F)) : 8.17 kg/m3
  • Compressibility Factor (Z) (1.013 bar and 15 °C (59 °F)) : 0.975
  • Specific gravity (air = 1) (1.013 bar and 21 °C (70 °F)) : 6.683
  • Specific volume (1.013 bar and 21 °C (70 °F)) : 0.125 m3/kg
  • Viscosity (1.013 bar and 0 °C (32 °F)) : 0.000125 Poise
  • Thermal conductivity (1.013 bar and 0 °C (32 °F)) : 12.728 mW/(m·K)
  • Thermal Conductivity, Gas @ 101.325 kPa and 25 °C: 13.8 mW/(m·K)
  • Vapour Pressure @ 21.1 °C: 792 kPa [4]

Major hazards[edit]


  1. ^ R. D. Fowler, W. B. Buford III, J. M. Hamilton, Jr., R. G .Sweet, C. E. Weber, J. S. Kasper, and I. Litant; Hamilton (1947). "Synthesis of Fluorocarbons". Ind. Eng. Chem. 39 (3): 292–298. doi:10.1021/ie50447a612.  Missing |last2= in Authors list (help)
  2. ^ Coburn, J. W. (1982). "Plasma-assisted etching". Plasma Chemistry and Plasma Processing. 2 (1): 1–41. doi:10.1007/BF00566856. 
  3. ^ D. Rogers (17–21 October 2005). Studies in the Future of Experimental Terraforming (PDF). 56th International Astronautical Congress of the International Astronautical Federation. Fukuoka, Japan: International Academy of Astronautics, and the International Institute of Space Law. 
  4. ^ a b "Encyclopédie des gaz". air liquide. 

External links[edit]