Gas mixtures containing fluoro-nitriles C 4 F 7 N or fluoro-ketones C 5 F 10 O as minority components (<20%) have been identified as promising alternatives to SF 6 in medium voltage gasinsulated switchgear (GIS) applications, because of their low Global Warming Potential together with their dielectric strength values being comparable to SF 6 . The buffer gases in such fluoro-nitrile or fluoro-ketone based gas mixtures are usually N 2 , O 2 , CO 2 , or air. In this contribution, we provide

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... ation results of transport properties, assuming local thermodynamic equilibrium (LTE), of thermal plasma containing following gas mixtures: C 4 F 7 N − CO 2 and C 4 F 7 N − CO 2 − O 2 . The modifications in the thermodynamic and transport properties upon the addition of oxygen to the C 4 F 7 N − CO 2 mixtures in the temperature range 300 K-30 kK at 1 bar are provided and discussed. These properties have been utilized to calculate the plasma temperature profile for a free-burning arc in a companion paper.