Octafluoropropane

Octafluoropropane

IUPAC name Octafluoropropane
Other names Freon 218 Perfluoropropane RC 218, PFC 218 R218 Flutec PP30 genetron 218
Identifiers
CAS number	76-19-7^Y
PubChem	6432
ChemSpider	6192^Y
UNII	CK0N3WH0SR^Y
DrugBank	DB00556
KEGG	D01738^Y
ChEBI	CHEBI:31980^N
ChEMBL	CHEMBL1663^Y
RTECS number	TZ5255000
Jmol-3D images	Image 1
SMILES FC(F)(F)C(F)(F)C(F)(F)F
InChI InChI=1S/C3F8/c4-1(5,2(6,7)8)3(9,10)11^Y Key: QYSGYZVSCZSLHT-UHFFFAOYSA-N^Y 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 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
MSDS	External MSDS
R/S statement	R: ? S: ?
Main hazards	Suffocation
NFPA 704	0 1 0
Flash point	N/A
Related compounds
Related halocarbons	Tetrafluoromethane Hexafluoroethane
Related compounds	Propane
Supplementary data page
Structure and properties	n, ε_r, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
N (verify) (what is: Y/N?) 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]

1 Applications
2 Liquid phase
3 Gaseous phase
4 Major hazards
5 References
6 External links

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

Greenhouse gas

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.