Octafluoropropane
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| Names | |
|---|---|
| IUPAC name
Octafluoropropane
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| Other names
Freon 218
Perfluoropropane RC 218, PFC 218 R218 Flutec PP30 genetron 218 | |
| Identifiers | |
3D model (JSmol)
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| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| DrugBank | |
| ECHA InfoCard | 100.000.857 |
| KEGG | |
PubChem CID
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| 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 | |
| 0.014 D | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Suffocation |
| NFPA 704 (fire diamond) | |
| 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 [77 °F], 100 kPa).
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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]
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]
It is the active liquid in both the PICASSO and COUPP dark matter bubble detectors.
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; Hamilton (1947). "Synthesis of Fluorocarbons". Ind. Eng. Chem. 39 (3): 292–298. doi:10.1021/ie50447a612.
{{cite journal}}: Missing|author2=(help)CS1 maint: multiple names: authors list (link) - ^ 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 (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) - ^ a b "Encyclopédie des gaz". air liquide.