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Performance Data on Cold Temperature Dispersion of CF3I



Jiann C. Yang, Thomas G. Cleary, Michelle K. Donnelly


Tritluoroiodomethane (CF3I) has been proposed as a potential replacement for Halon 1301 in aircraft engine nacelle and dry bay fire protection applications. The potential use of CF3I in fuel tank ullage inerting has also been considered recently. Before CF3I can be considered as a potential drop-in replacement, several operational issues need to be addressed or re-examined. The proposed work is intended to examine one important aspect related to the application of CF3I cold temperature discharge of CF3I into a sub-zero environment. Table 1 lists some of the physical properties of CF3I and CF3Br. Since CF3I has a normal boiling point of -22 deg C, the dispersion of CF3I into air at temperatures down to -40 deg C may not be as effective as halon 1301 which has a normal boiling point of -57.8 deg C. Although discharge of cold CF3I (chilled to about -40 deg C) into a compartment at ambient room temperature has been examined at NIST, the discharge of cold CF3I into a cold compartment has not been performed, or at least has not been documented in open literature. In order to assure that there is no substantial deterioration in dispersion performance of CF3I under cold temperature applications, discharge tests in a simulated fire compartment at the lowest temperatures expected in service should be conducted.
Proceedings Title
Halon Options Technical Working Conference
Conference Dates
May 2-4, 2000
Conference Location
Albuquerque, NM


halon alternatives, temperature, physical properties, evaporation, dispersions, halons


Yang, J. , Cleary, T. and Donnelly, M. (2000), Performance Data on Cold Temperature Dispersion of CF3I, Halon Options Technical Working Conference, Albuquerque, NM, [online], (Accessed April 14, 2024)
Created May 2, 2000, Updated February 19, 2017