The long-term use of EPDM rubber sealing material for GIS equipment will occur aging phenomenon and will

in case of serious condition

lead to the sealing out of function as well as cause serious accident. Therefore

the thermal oxygen aging method is used in this paper to study the mechanical property variation of such two forms of EPDM rubber samples as sealing ring and sealing strip before and after aging

so to provide guidance for the long-term application of EPDM in GIS equipment. The results show that the Shore hardness will gradually increase with the increase of aging time

the tensile strength will increase firstly and then decrease

but the breakage elongation will always decrease. It is found by comparing the performance of the sealing ring and the sealing strip that the performance variation of the sealing ring and the sealing strip has the same trend

but in the process of the variation

the Shore hardness

tensile strength and breakage elongation of the sealing strip are greater than those of the sealing ring.