Accession Number : ADA293774

Title :   Evaluation of Halon Alternatives in Inerting Experiments.

Descriptive Note : Final rept. Oct 92-Dec 94,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Finnerty, Anthony E. ; Saunders, Dawnn M.

PDF Url : ADA293774

Report Date : APR 1995

Pagination or Media Count : 33

Abstract : Inerting experiments were conducted in a 20-liter stainless steel chamber. Eight potential Halon 1301 replacement agents were used to inert butane-air mixtures. The agents were ranked on the amount required to completely inert the system and on their tendencies to form hydrogen fluoride. A specific ion electrode was used to determine the amount of hydrogen fluoride formed when less than the amount of agent required for complete inertion was used in an experiment. The two iodine-containing agents, perfluoroethyl iodide and perfluoromethyl iodide, were superior to the other potential replacement agents in that less concentration was required for inertion and less hydrogen fluoride formed than with the others. The ability of perfluoroethyl iodide and perfluoromethyl iodide, which are chemical fire-extinguishing agents, to act as inerting agents is attributed to the ease of breaking of the relatively weak (ca. 57 kcal/mole) carbon to iodine bond at low temperatures. This enabled the iodine-containing agents to act as energy-absorbing agents, which is important in preventing ignition of fuel-air-agent mixtures. jg

Descriptors :   *INERT MATERIALS, *HYDROGEN FLUORIDE, LOW TEMPERATURE, METHYL RADICALS, AIR, POLYMERS, STAINLESS STEEL, CARBON, CHEMICAL BONDS, ELECTRODES, IODINE, REPLACEMENT, FUEL AIR RATIO, FIRE EXTINGUISHING AGENTS, HALOGENATED HYDROCARBONS, ETHYL RADICALS, ION SELECTIVE ELECTRODES, FLUORINATED HYDROCARBONS, BUTANES, ENERGY ABSORBERS.

Subject Categories : Organic Chemistry
      Inorganic Chemistry
      Physical Chemistry
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE