Octafluoropropane
Structural formula of octafluoropropane
Ball-and-stick model of octafluoropropane
Names
Preferred IUPAC name
Octafluoropropane
Other names
Freon 218
Perfluoropropane
RC 218, PFC 218
R-218
Flutec PP30
genetron 218
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.000.857
KEGG
RTECS number
  • TZ5255000
UNII
  • InChI=1S/C3F8/c4-1(5,2(6,7)8)3(9,10)11 checkY
    Key: QYSGYZVSCZSLHT-UHFFFAOYSA-N checkY
  • InChI=1/C3F8/c4-1(5,2(6,7)8)3(9,10)11
    Key: QYSGYZVSCZSLHT-UHFFFAOYAL
  • FC(F)(F)C(F)(F)C(F)(F)F
Properties
C3F8
Molar mass 188.020 g·mol−1
Appearance Colorless gas with
faintly sweet odor
Density 8.17 g/L
Melting point −147.6 °C (−233.7 °F; 125.5 K)
Boiling point −36.7 °C (−34.1 °F; 236.5 K)
Critical point (T, P) 345.05 K (71.90 °C), 26.8 bar
Vapor pressure 792 kPa (21.1 °C)[1]
Thermal conductivity 13.8 mW/(m·K)[1]
Viscosity 0.000125 Poise (0 °C)[1]
Structure
0.014 D
Thermochemistry
149 J/(mol·K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Suffocation
GHS labelling:
GHS04: Compressed Gas
H280
P410+P403
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
1
0
0
SA
Flash point N/A
Related compounds
Related halocarbons
 Tetrafluoromethane
Hexafluoroethane
Related compounds
 Propane
Supplementary data page
Octafluoropropane (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 checkY☒N ?)
Infobox references

Octafluoropropane (C3F8) is the perfluorocarbon counterpart to the hydrocarbon propane. This non-flammable synthetic material has applications in semiconductor production and medicine. It is also an extremely potent greenhouse gas.

Manufacture

Octafluoropropane can be produced either by electrochemical fluorination or by the Fowler process using cobalt fluoride.[2]

Applications

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.[3]

In medicine, octafluoropropane may compose the gas cores of microbubble contrast agents used in contrast-enhanced ultrasound. Octafluoropropane microbubbles reflect sound waves well and are used to improve the ultrasound signal backscatter.

It is used in eye surgery, such as pars plana vitrectomy procedures where a retina hole or tear is repaired. The gas provides a long-term tamponade, or plug, of a retinal hole or tear and allows re-attachment of the retina to occur over the several days following the procedure.

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

It has been featured in some plans for terraforming Mars. With a greenhouse gas effect 24,000 times greater than carbon dioxide (CO2), octafluoropropane could dramatically reduce the time and resources it takes to terraform Mars.[4]

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

Major hazards

References

  1. 1 2 3 "Encyclopédie des gaz". air liquide. Archived from the original on 2016-03-03. Retrieved 2008-01-22.
  2. ↑ Fowler RD, Buford III WB, Hamilton Jr JM, Sweet RG, Weber CE, Kasper JS, Litant I (1947). "Synthesis of Fluorocarbons". Ind. Eng. Chem. 39 (3): 292–298. doi:10.1021/ie50447a612.
  3. ↑ Coburn, J. W. (1982). "Plasma-assisted etching". Plasma Chemistry and Plasma Processing. 2 (1): 1–41. doi:10.1007/BF00566856. S2CID 95361338.
  4. ↑ 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.
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