Sealing member
A sealing member includes a sliding portion made of a vulcanized rubber composition. The rubber composition includes a carboxyl-containing acrylic rubber, a silica, and a glass fiber. A content of the silica is 25 to 100 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.
1. A sealing member, comprising:
a sliding portion made of a vulcanized rubber composition, wherein:
the rubber composition includes a carboxyl-containing acrylic rubber, a silica, and a glass fiber;
a content of the silica is 25 to 100 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber; and
a pH of the silica is 8 or more and 12 or less.
2. The sealing member according to claim 1 , wherein the pH of the silica is 10 or more and 12 or less.
3. The sealing member according to claim 2 , wherein in the rubber composition, a content of the glass fiber is 20 to 40 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.
4. The sealing member according to claim 1 , wherein in the rubber composition, a content of the glass fiber is 20 to 40 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.
5. The sealing member according to claim 1 , wherein a content of the silica is 30 to 80 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.
6. The sealing member according to claim 1 , wherein a content of the silica is 45 to 65 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.