These tests, in conjunction with the Navy's evaluation tests, have shown that SF₆, based on equal initial volumetric concentrations is the best of the two identified Halon 1301 simulants when used in certification testing of the aircraft cargo compartment fire suppression system. Results showed that SF₆ and Halon 1301 had similar decay rates and volumetric concentrations when submitted to various leak rates, cargo sizes, and metering. HFC 125 does not mimic halon very well in sustained total flood applications; after five minutes, its volumetric concentration tends to decay at a lower rate due to its lower specific vapor density. SF₆ is an excellent simulant when considering aircraft cargo leakage rate, stratification, and the integration of a suppression system with a metering system.