Pentafluoropropane

1,1,1,3,3-Pentafluoropropane (HFC-245fa) is a hydrofluorocarbon is a colorless gas used primarily for closed-cell spray foam insulation. HFC-245fa is also known as pentafluoropropane and by its chemical name 1,1,1,3,3-pentafluoropropane.

Pentafluoropropane
Names
IUPAC name
1,1,1,3,3-pentafluoropropane
Other names
R-245fa; HFC-245fa; Enovate 3000; Genetron 245fa; AC1Q4KND; UNII-TA9UOF49CY
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.114.041
UNII
Properties
C3H3F5
Molar mass 134.049 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
Hazards
Main hazards Simple Asphyxiant
Flash point −24.963 °C (−12.933 °F; 248.187 K)
412 °C (774 °F; 685 K)[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Environmental Effects

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.[4] It does have a high global warming potential of 950 (950 times the global warming effect of CO
2).[5][6] Honeywell refers to this as "acceptable" in their literature, but they don't include the actual number.

Economics

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.[7] As of 2007, and prior to Sinochem's production it was already a high volume production chemical, with over 1 million pounds produced annually.[4]

Manufacturing History

Pentafluoropropane is produced by Honeywell and in Asia by Sinochem.[8] Honeywell markets HFC-245fa under the Enovate and Genetron 245fa brand names. 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.

See also

References
  1. 1,1,1,3,3-pentafluoropropane - CAS # 460-73-1, Columbia Analytical Services, retrieved May 2012 Check date values in: |access-date= (help)
  2. Isobaric Properties for 1,1,1,3,3-Pentafluoropropane (R245fa), National Institute of Standards and Technology, retrieved 24 January 2021
  3. Genetron 245fa Material Safety Data Sheet (PDF), Honeywell, September 2000, MSDS Number: GTRN-0040, retrieved May 29, 2012
  4. HFC-245fa- Product Stewardship Summary (PDF), Honeywell, December 2007, retrieved 13 May 2012
  5. Other Gases: Hydrofluorocarbons, Perfluorocarbons, and Sulfur Hexafluoride, U.S. Energy Information Administration, retrieved 13 May 2012
  6. JACC 044 : 1,1,1,3,3-pentafluoropropane (HFC-245fa) (CAS No. 460-73-1), European Centre for Ecotoxicology, June 2004, retrieved 13 May 2012
  7. McCoy, Michael (October 30, 2000), "Regulatory Issues Heat Up For Blowing Agents", Chemical and Engineering News Online, 78 (44): 22–23, ISSN 0009-2347, archived from the original on August 23, 2011, retrieved May 3, 2020
  8. Sinochem and Honeywell Announce Formation of Joint Venture in China, Sinochem Group, October 10, 2011
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