Sulfur hexafluoride（SF

6

）has excellent insulation and arc-extinguishing properties

but its influence ofgreenhouse effect on the global environment is always urging researchers to constantly search for gas alternatives.The insulation and arc-extinguishing capabilities of C

5

F

10

O/CO

2

have been studied in the industry

but t

he report onits compatibility as a potential alternative to SF

6

with metal material is very rare.In this paper

the compatibility ofC

5

F

10

O/CO

2

with red copper material commonly used in high-voltage electrical equipment at temperature of differentfault points is studied.The gas composition and surface morphology are characterized and analysed by the test.Itwas found that C

5

F

10

O/CO

2

in the case of contacting with red copper at 80℃

begins to decompose

and the contentof decomposition products increases with the rise of temperature at the fault point and.At the same time

the coloron surface of the red copper also gradually darkens and corrosion of the red copper is gradually serious.It is shownby the test that

in case of temperature rise

the compatibility of C

5

F

10

O/CO

2

with copper is weak

but the silver plat-ing on the surface of the red copper can have a good anti-corrosion effect.Therefore it is suggested that

in case ofusing C

5

F

10

O/CO

2

as the alternative to SF

6

as electrical insulating medium

the surface of the red copper is subject tosilver plating treatment

which has certain application and reference.