Halotron I

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Halotron I

Chemical structures of dichlorotrifluoroethane (top) and tetrafluormethane (bottom), the two major components of Halotron I
GHS labelling:
GHS07: Exclamation markGHS04: Compressed Gas
NFPA 704 (fire diamond)
Lethal dose or concentration (LD, LC):
3.2% (4 hrs, inhalation)
Safety data sheet (SDS) Halotron
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Halotron I is a fire extinguishing agent based on the raw material HCFC-123 (93%) mixed with tetrafluoromethane and argon as propellants.

Global emission concerns[edit]

It was originally introduced in 1992 to replace the severely ozone-depleting Halon 1211 (bromochlorodifluoromethane). Halon 1211 has a global warming potential of 1890, whereas Halotron I's GWP is 77, being a 96% reduction.[2]


In December 2011, Halotron I was tested against "hidden fires", spurred by the effectiveness its predecessor demonstrated on an in-flight fire aboard a Delta L-1011 flight on March 17, 1991. The test was conducted at UL, and demonstrated similar effectiveness as Halon 1211, with significantly less human and global harm.[3] Although the fire extinguishing effectiveness is similar, Halotron I requires a larger chemical volume to get the same ratings as Halon 1211.

DOT classification[edit]

UN1956, Compressed Gases, N.O.S., Nonflammable Gas. IMCO CLASS: 2.2


  1. ^ "Halotron". www.halotron.com. Retrieved 24 April 2023.
  2. ^ "Sixth Triennial International Fire & Cabin Safety Research Conference" (PDF). fire.tc.faa.gov. 2010. Retrieved 24 April 2023.
  3. ^ "R0201336.pdf" (PDF). NIST.gov. Retrieved December 23, 2017.