Regarding SF
6-CO
2 mixture gases, the equilibrium compositions in a temperature range from 300 to 30,000K at 0.6MPa were calculated to find out predominant particles with high number densities. Eighty-five particles, including 47 neutral molecules originating from SF
6 and CO
2, were taken into account as the component species. At the temperatures
T of about 7,000K or above, S, F, C, O, their positive ions and electrons are present as the predominant particles, for almost all of the CO
2 concentration,
XCO2 . Not only SF, SF
2, CO and CO
2 but also SO and SO
2 behave as the predominant particles in the temperature range from 3,000 to 7,000K, almost independent of
XCO2. On the contrary, the predominant particles in the temperature range from 300 to 3,000K distinctly depend on
XCO2. By way of example, for the gas of
XCO2=0.1, three particles SF
6, SO
2F
2 and CF
4 have the high number densities at
T below 1,000K. By way of another example, particles CO
2, SO
2F
2, CF
4 and CO
2F
2, for
XCO2=0.6, shows the high number densities at
T below 1,000K. On the basis of these results, the predominant particles present after an arc extinction are discussed as a function of
XCO2.
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