Heat Resistant Seal Member

A heat resistant seal member comprising:

• 100 parts by weight of a ternary fluoroelastomer,
• 5 to 15 parts by weight of first carbon nanofibers having an average diameter of not less than 60 nm and not more than 200 nm;
• 10 to 15 parts by weight of second carbon nanofibers having an average diameter of not less than 9 nm and not more than 20 nm;
• and
• 0 to 20 parts by weight of carbon black having an average particle size between 25 nm and 500 nm;
• wherein the first carbon nanofibers and the second carbon nanofibers are both contained therein, and the total amount of the first carbon nanofibers and the second carbon nanofibers is 15 to 30 parts by weight, and the total amount of the first carbon nanofibers, the second nanofibers, and the carbon black is 20 to 45 parts by weight.