A sealing member containing a copolymer containing tetrafluoroethylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro (propyl vinyl ether) unit of 4.0 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate of 26 to 37 g/10 min, and the number of functional groups of —CF═CF.sub.2, —CF.sub.2H, —COF, —COOH, —COOCH.sub.3, —CONH.sub.2 and —CH.sub.2OH of more than 50 per 10.sup.6 main-chain carbon atoms, wherein the sealing member has a thickness of 0.5 to 2.5 mm and a sealing area of 0.5 to 50 cm.sup.2, and wherein the sealing member is in a state of being compressed at a compression deformation rate of 20 to 60%. Also disclosed is a power storage assembly including the sealing member.

A coating solution comprising an organic solvent solution containing polyol-crosslinkable fluororubber, a polyol vulcanizing agent, and N-phenyl-3-aminopropyltrialkoxysilane, preferably a coating solution further containing an epoxy resin in addition thereto, and a fluororubber metal laminated sheet formed by applying the above coating solution to a metal sheet, followed by vulcanization. The coating solution can not only impart stability over time to the fluororubber paste, but also improve the interlayer adhesion and abrasion resistance of the fluororubber metal laminated sheet. Therefore, when it is used as a cylinder head gasket, it is possible to cope with the reduction in rigidity due to the increase in combustion pressure of the engine, and with weight saving. As a result, it will greatly contribute to the improvement of fuel efficiency of automobiles.

A fluororubber composition comprising 3 to 20 parts by weight of carbon fibers and 1 to 8 parts by weight of carbon nanotubes based on 100 parts by weight of fluororubber. The crosslinked molded article obtained from the fluororubber composition has excellent effects of not only imparting oil film retention, but also improving the material strength of fluororubber due to the combined use of carbon nanotubes, which have high reinforcing properties. Further, the fluororubber composition can give a fluororubber crosslinked product excellent in abrasion resistance and pressure resistance.

A seal material for a semiconductor manufacturing device is made of a rubber composition containing fluororubber and phenol resin powder. The content of the phenol resin powder is 1 part by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the fluororubber. The average particle size of the phenol resin powder is 1 μm or more and 20 μm or less.

a fluororubber composition includes (a) a peroxide-crosslinkable fluorine-containing elastomer; (b) a spherical particle of a silica/cured melamine resin composite; (c) carbon black; (d) an organic peroxide as a crosslinking agent; and (e) a co-crosslinking agent.

A pressurised dispensing container (10) comprising a container (11) for product to be dispensed, and a valve fixed to the container, wherein the container contains a propellant comprising 1,1-difluoroethane or a derivative thereof and optionally ethanol. The valve comprises a valve stem (15), a valve body (16, 18) and one or more seals (20, 21), the valve stem being slidable within the valve body, the one or more seals co-operating with the valve stem for regulating discharge of a fluid. The valve further comprises a sealing gasket (14) for sealing the valve to the dispensing container. The one or more seals (20, 21) is/are formed from (i) an elastomeric composition, preferably an elastomeric composition comprising an ethylene-propylene-diene terpolymer. The sealing gasket (14) is formed from (ii) an elastomeric composition comprising an isobutylene polymer or co-polymer thereof.

Disclosed is a gas seal member for high-pressure hydrogen device with sufficiently reduced occurrence of both swelling destruction and blister destruction. The gas seal member is formed of a cross-linked product of an elastomer composition which comprises an elastomer and fibrous carbon nanostructures, wherein a hydrogen diffusion coefficient D1 of a cross-linked product of an elastomer component including the elastomer and a hydrogen diffusion coefficient D2 of the cross-linked product of the elastomer composition satisfy the relationship 0.7<D2/D1<1.0.

To achieve properties such as a desirable compression fracture property, desirable compression set, and the like in the elastomer composition and the seal material using same. The elastomer composition of the present disclosure therefore includes an elastomer, phenol resin in powder form, and silica in powder form. The seal material of the present disclosure is obtained by crosslinking and molding the elastomer composition of the present disclosure. The seal material may be used in a semiconductor manufacturing device.

A rubber composition comprising: (a) a crosslinking reactive fluorine-containing rubber; (b) a compound represented by the following formula (b-1): and

##STR00001## (c) a compound represented by the following formula (c-1):

##STR00002##

A gasket material to be mounted in a vehicle engine, wherein, on one or both sides of a steel plate, a rubber layer is formed via a coating film including a reaction product of an acid component and a metal or a reaction product of an acid component and a metal compound, and at least one selected from zirconia, alumina and titania.