1,1,1,2,3,3,3-Heptafluoropropane

1,1,1,2,3,3,3-Heptafluoropropane[1]
Names
Preferred IUPAC name
1,1,1,2,3,3,3-Heptafluoropropane
Other names
Heptafluoropropane
Apaflurane
HFC-227ea
R-227ea
HFC-227
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.006.437
KEGG
UNII
UN number UN3296
Properties
C3HF7
Molar mass 170.03 g/mol
Density 1.46 g/cm3 at -16 °C
Melting point −131 °C (−204 °F; 142 K)
Boiling point −16.4 °C (2.5 °F; 256.8 K)
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
0
1
1
Related compounds
Related compounds
 1,1,1,2,2,3,3-Heptachloropropane
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

1,1,1,2,3,3,3-Heptafluoropropane, also called heptafluoropropane, HFC-227 or HFC-227ea (ISO name), as well as apaflurane (INN), is a colourless, odourless gaseous halocarbon commonly used as a gaseous fire suppression agent.

Chemistry

Its chemical formula is CF3-CHF-CF3, or C3HF7. With a boiling point of −16.4 °C, it is a gas at room temperature. It is slightly soluble in water (260 mg/L).

Use

HFC-227ea finds use in fire suppression systems in data processing and telecommunication facilities, and in protection of many flammable liquids and gases. HFC-227ea falls in the category of Clean Agents and is governed by NFPA 2001 - Standard for Clean Agent Fire Extinguishing Systems. Effective fire suppression requires introducing a concentration of the HFC-227ea agent between 6.25% and 9% depending on the hazard being protected. Its NOAEL level for cardiac sensitization is 9%. The United States Environmental Protection Agency allows concentration of 9% volume in occupied spaces without mandated egress time, or up to 10.5% for a limited time. Most fire suppression systems are designed to provide concentration of 6.25-9%.

The HFC-227ea fire suppression agent was the first non-ozone depleting replacement for Halon 1301. In addition, HFC-227ea leaves no residue on valuable equipment after discharge.[2]

HFC-227ea contains no chlorine or bromine atoms, presenting no ozone depletion effect. Its atmospheric lifetime is approximated between 31 and 42 years. It leaves no residue or oily deposits and can be removed by ventilation of the affected space.

As an aerosol propellant, HFC-227ea is used in pharmaceutical metered dose inhalers such as those used for dispensing asthma medication.

Safety

At high temperatures, heptafluoropropane will decompose and produce hydrogen fluoride. This is observable as presence of sharp, pungent odour, which can be perceived in concentrations far below a dangerous level. Other decomposition products include carbonyl fluoride, carbon monoxide and carbon dioxide. Prior to re-entry of a room where HFC-227ea system has been activated to suppress a fire, the atmosphere should be tested. An Acid Scavenging Additive added to heptafluoropropane is able to reduce the amount of hydrogen fluoride. Contact with liquid HFC-227ea may cause frostbite.

Tradenames for HFC-227ea used as fire suppression agent

See also

Other fire suppression agents:

References

  1. ↑ NIST datapage for heptafluoropropane
  2. ↑ Fike FE-227 Product Page
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