Pentafluoropropane
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| Names | |
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| IUPAC name
1,1,1,3,3-pentafluoropropane
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| Other names
R-245fa; HFC-245fa; Enovate 3000; Genetron 245fa; AC1Q4KND; UNII-TA9UOF49CY
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| Identifiers | |
| 460-73-1 [1] | |
| ChemSpider | 61345 |
| Jmol 3D model | Interactive image |
| PubChem | 68030 |
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| Properties | |
| C3H3F5 | |
| Molar mass | 134.05 g·mol−1 |
| Appearance | colorless gas |
| Density | 1404.1 kg/m3 (liquid at 1 bar, 0 °C) 5.84 kg/m3 (vapor at 1 bar, 15 °C)[2] |
| Boiling point | 15.3 °C (59.5 °F; 288.4 K) |
| 7.18 g/l[3] | |
| log P | 1.68 |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
1,1,1,3,3-Pentafluoropropane (HFC-245fa) is a hydrofluorocarbon used primarily for closed-cell spray foam insulation produced by Honeywell and in Asia by Sinochem.[4] Honeywell markets HFC-245fa under the Enovate and Genetron 245fa brand names. HFC-245fa is also known as pentafluoropropane and by its chemical name 1,1,1,3,3,-pentafluoropropane. Unlike CFC and HCFC blowing agents formerly used for this purpose, it has no ozone depletion potential and is nearly non-toxic. Although it is intended to remain trapped within the foam insulation, it is practically non biodegradable with a lifetime of 7.2 years when it eventually does escape into the atmosphere.[5] It does have a high global warming potential of 950 (950 times the global warming effect of CO2).[6][7] Honeywell refers to this as "acceptable" in their literature, but they don't include the actual number.
AlliedSignal, who adopted the Honeywell name after acquiring it, decided in 1999 to provide a non ozone depleting blowing agent as an alternative for dichlorofluoroethane (HCFC-141b) and trichlorofluoromethane (CFC-11). Competitors Atofina and General Electric pursued strategies using other agents. One of the disadvantages of R-245fa is its cost. In 2000 R-141b cost one US dollar per pound, whereas R-245fa cost $2.50 to $4.00 per pound.[8] As of 2007, and prior to Sinochem's production it was already a high volume production chemical, with over 1 million pounds produced annually.[5]
See also
References
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