Application of Halon 1301 to the Prevention of or Extinguishment of Aerozine -50 Fires

An investigation was conducted into the possibility of using Halon 1301 (bromotrifluoromethane) to inert enclosed, personnel-occupied spaces where spills of Aerozine-50 might occur. The effectiveness of this agent in extinguishing Aerozine-50 fires was also investigated. The concentrations of Halon 1301 required to inert Aerozine-50 vapor-air mixtures depended upon the fuel vapor concentration; except at very high fuel concentration, the amount required was always less than that for nitrogen. High concentrations of Halon 1301 are required to extinguish Aerozine-50 fires, and extinguishment appears possible only during the early stages of burning, before the propellant becomes too concentrated in the high-boiling hydrazine component. There is no advantage in the simultaneous application of C02 and Halon 1301, but the concurrent application of H2O and Halon 1301 provides relatively easy extinguishment