This paper describes two fundamental characteristics of gas mixtures with c-C
4F
8 (perfluorocyclobutane), which the authors have proposed as a possible candidate for substituting SF
6 in gas insulation. One is concerning the release rate of an electro-negative gas from a gas mixture at liquefied recovery. Gas mixtures with c-C
4F
8 have the advantage of much lower release rate over SF
6/N
2. The other is DC discharge characteristics for a hemispherically-capped rod-to-plane gaps. Discharge voltages have been compared between SF
6/N
2, c-C
4F
8/N
2, and c-C
4F
8/CO
2 for a mixing ratio of an electronegative gas up to 20%.
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