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Octafluoropropane

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Octafluoropropane
Octafluoropropane
Names
IUPAC name Octafluoropropane
Other names Freon 218
Perfluoropropane
RC 218, PFC 218
R218
Flutec PP30
genetron 218
Identifiers
CAS Number
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.857 Edit this at Wikidata
KEGG
PubChem CID
RTECS number
  • TZ5255000
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C3F8/c4-1(5,2(6,7)8)3(9,10)11Key: QYSGYZVSCZSLHT-UHFFFAOYSA-N
  • InChI=1/C3F8/c4-1(5,2(6,7)8)3(9,10)11Key: QYSGYZVSCZSLHT-UHFFFAOYAL
SMILES
  • FC(F)(F)C(F)(F)C(F)(F)F
Properties
Chemical formula C3F8
Molar mass 188.02 g/mol
Appearance Colorless gas with
faintly sweet odor
Density 8.17 g/l, gas
Melting point -183 °C (90.15 K)
Boiling point -36.7 °C (236.45 K)
Structure
Dipole moment 0.014 D
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Suffocation
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability (red): no hazard codeInstability (yellow): no hazard codeSpecial hazards (white): no code
1
Flash point N/A
Related compounds
Supplementary data page
Octafluoropropane (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

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.

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.

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.

Liquid phase

  • 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

Gaseous phase

  • 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

Major hazards

References

  1. R. D. Fowler, W. B. Buford III, J. M. Hamilton, Jr., R. G .Sweet, C. E. Weber, J. S. Kasper, and I. Litant (1947). "Synthesis of Fluorocarbons". Ind. Eng. Chem. 39 (3): 292–298. doi:10.1021/ie50447a612.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  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). 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. {{cite conference}}: Check date values in: |date= and |year= / |date= mismatch (help); Cite has empty unknown parameters: |booktitle=, |coauthors=, and |conferenceurl= (help); Unknown parameter |month= ignored (help)
  4. ^ "Encyclopédie des gaz". {{cite web}}: Unknown parameter |publischer= ignored (help)

External links

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