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| Octafluoropropane | |
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| IUPAC name | Octafluoropropane |
| Other names | Freon 218 Perfluoropropane RC 218, PFC 218 R218 Flutec PP30 genetron 218 |
| Identifiers | |
| CAS number | 76-19-7 |
| RTECS number | TZ5255000 |
| SMILES |
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| 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 |
| Main hazards | Suffocation |
| NFPA 704 |
 0
1
0
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| R/S statement | R: ? S: ? |
| Flash point | N/A |
| Related compounds | |
| Related halocarbons | Tetrafluoromethane Hexafluoroethane |
| Related compounds | Propane |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references |
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Octafluoropropane (C3F8) is a perfluorocarbon, a non-flammable greenhouse gas that can be produced either by electrochemical fluorination or by the Fowler process using cobalt fluoride.1 It has featured in some plans for terraforming Mars.2
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Applications
In the electronics industry, octafluoropropane is mixed with oxygen and used as an 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 reflects sound waves well and are used to improve the ultrasound signal backscatter.
Under the name R-218, octafluoropropane is used in other industries as a component of refrigeration mixtures.
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
- Non-toxic
- Ozone Depletion Potential (ODP): 0.000
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:.
- ^ D. Rogers (17-21). "Studies in the Future of Experimental Terraforming" in 56th International Astronautical Congress of the International Astronautical Federation., Fukuoka, Japan: International Academy of Astronautics, and the International Institute of Space Law.
- ^ Coburn, J. W. (1982). "Plasma-assisted etching". Plasma Chemistry and Plasma Processing 2 (1): 1–41. doi:.
- ^ a b "Encyclopédie des gaz".
External links
