- Octafluoropropane
-
Octafluoropropane 
OctafluoropropaneOther namesFreon 218
Perfluoropropane
RC 218, PFC 218
R218
Flutec PP30
genetron 218Identifiers CAS number 76-19-7 
PubChem 6432 ChemSpider 6192 UNII CK0N3WH0SR DrugBank DB00556 KEGG D01738 ChEBI CHEBI:31980 
ChEMBL CHEMBL1663 RTECS number TZ5255000 Jmol-3D images Image 1 - FC(F)(F)C(F)(F)C(F)(F)F
- InChI=1S/C3F8/c4-1(5,2(6,7)8)3(9,10)11
Key: QYSGYZVSCZSLHT-UHFFFAOYSA-N
InChI=1/C3F8/c4-1(5,2(6,7)8)3(9,10)11
Key: QYSGYZVSCZSLHT-UHFFFAOYAL
Properties Molecular formula C3F8 Molar mass 188.02 g/mol Appearance Colorless gas with
faintly sweet odorDensity 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 MSDS External MSDS R/S statement R: ?
S: ?Main hazards Suffocation NFPA 704 
010Flash point N/A Related compounds Related halocarbons Tetrafluoromethane
HexafluoroethaneRelated compounds Propane Supplementary data page Structure and
propertiesn, εr, etc. Thermodynamic
dataPhase behaviour
Solid, liquid, gasSpectral data UV, IR, NMR, MS 
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)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]
Contents
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.[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]
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 [4]
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 [4]
Major hazards
References
- ^ 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.
- ^ Coburn, J. W. (1982). "Plasma-assisted etching". Plasma Chemistry and Plasma Processing 2 (1): 1–41. doi:10.1007/BF00566856.
- ^ D. Rogers (17-21). "Studies in the Future of Experimental Terraforming". 56th International Astronautical Congress of the International Astronautical Federation. Fukuoka, Japan: International Academy of Astronautics, and the International Institute of Space Law. http://pdf.aiaa.org/preview/CDReadyMIAF05_1429/PVIAC-05-D4.1.06.pdf.
- ^ a b "Encyclopédie des gaz". air liquide. http://encyclopedia.airliquide.com/encyclopedia.asp?GasID=47&CountryID=19&LanguageID=2.
External links
Categories:- Fluorocarbons
- Organofluorides
- Refrigerants
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