[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. The surface layer portion has high durability due to an action of the compatible portion, and imparts high slidability to the sealing member through the action of the lubrication portion.

This disclosure includes vacuum-assisted tools (10a) for use in pressing stacks (284) of one or more laminae (288a-288i) and related methods. Some tools include first and second plates (14a-14f), wherein each of the plates has an inner face and an opposing outer face, and the plates are configured to be disposed on opposing sides of a stack of one or more laminae such that the inner faces of the plates face the stack to define an interior volume (18) containing the stack between the inner faces, one or more seals (176, 176a-176e) configured to be disposed between the plates such that the one or more seals surround at least a portion of the interior volume, and a port (224) configured to be coupled to the first plate, the second plate, and/or at least one of the one or more seals, the port configured to permit fluid communication between the portion of the interior volume and a vacuum source (26).

Provided is a composition for a gas seal member that can form a gas seal member for a high-pressure hydrogen device that is capable of sufficiently inhibiting both swelling destruction and blister destruction. The composition for a gas seal member is a composition for a gas seal member used in a high-pressure hydrogen environment and contains an elastomer and fibrous carbon nanostructures. The fibrous carbon nanostructures are contained in a proportion of not less than 1 part by mass and not more than 10 parts by mass per 100 parts by mass of the elastomer. An area fraction S (%) of aggregates of the fibrous carbon nanostructures in a cross-section of the composition for a gas seal member and a volume percentage V (volume %) of the fibrous carbon nanostructures in the composition for a gas seal member satisfy a relationship 0S/V2.0.

[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.

A seal comprising a jacket comprising an annular body defining a central axis and a recess extending into the annular body concentric to the central axis, wherein the jacket comprises at least 30 wt % of a PTFE and at least 10 wt % of a filler material, and wherein the filler material comprises a boron-containing material, a nitrogen-containing material, a titanium-containing material, a silicon-containing material, a carbon fiber, a glass fiber, or a combination thereof; and an energizing element disposed in the recess.

A fluorine rubber composition contains a component A that is a base rubber containing a hydrogen-containing fluorine rubber as a main component, a component B that is a compound having a perfluoropolyether skeleton, and a component C that is a powdery filler having a bulk density of 0.4 g/cm.sup.3 or less. A part or whole of the component B contains an alkenyl group in a molecule. (p.sub.C/d.sub.C)/(p.sub.B/d.sub.B)?4 is satisfied wherein d.sub.B is a density of the component B, p.sub.B is a content of the component B relative to 100 parts by mass of the component A, d.sub.C is the bulk density of the component C, and p.sub.C is a content of the component C relative to 100 parts by mass of the component A.

A fluororubber composition is provided including at least two peroxide-crosslinkable fluorine-containing elastomers each containing a structural unit of perfluoroalkoxy vinyl ether.

Provided is a fluoroelastomer crosslinkable composition containing: a polyol-crosslinkable fluoroelastomer (a); and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the following general formula (b) and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound.

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(wherein all symbols are as defined in the specification).

Provided is a fluoroelastomer crosslinkable composition, containing a polyol-crosslinkable fluoroelastomer (a) and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the general formula (b) set forth in the description and a salt of the compound with an alkali metal, an alkaline earth metal, or an onium compound.

Provided are a perfluoroelastomer composition containing a perfluoroelastomer, a peroxide crosslinking agent, a co-crosslinking agent that is a diolefin compound, and an organic pigment; and a sealing material containing a crosslinked product of the perfluoroelastomer composition.