Abstract: [Object] To provide a technology for imparting favorable slidability to fluorine rubber. [Solving Means] A composition for a sealing member includes: 100 parts by weight of an uncrosslinked fluorine rubber component; and 0.5 to 50 (inclusive) parts by weight of a particulate resin. The particulate resin includes a compatible portion and a lubrication portion, the compatible portion having compatibility with the fluorine rubber component, the lubrication portion having lubricity with respect to the fluorine rubber component. During molding of the composition for a sealing member, crosslinking of the fluorine rubber component progresses and at least a part of the particulate resin moves to a surface due to an action of the lubrication portion. As a result, a surface layer portion including a compatible portion and a lubrication portion is formed on a surface of a molded sealing member.

Abstract: [Object] To provide a ring-shaped sealing member having both the sealing property and slidability. [Solving Means] A sealing member is formed in a ring shape and has a sliding surface. The sealing member includes: 100 parts by weight of fluorine rubber; and 0.5 to 50 (inclusive) parts by weight of a particulate resin. The particulate resin includes a compatible portion and a lubrication portion, the compatible portion having compatibility with the fluorine rubber, the lubrication portion having lubricity with respect to the fluorine rubber. A Shore A hardness measured using the sliding surface as a pressing surface is not less than 80. In this sealing member, since rubber elasticity is achieved by the fluorine rubber, a favorable sealing property can be realized. Further, it is possible to impart high slidability to the sealing member by the action of the lubrication portion of the particulate resin. Therefore, this sealing member has both the sealing property and slidability.