Abstract: The present invention relates to a fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and (ii) a prepolymer of triallyl isocyanurate. Also disclosed is a method for producing the fluororubber molded article.

Abstract: The present invention provides a fluororubber molded article obtained by a process comprising subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber which comprises a tetrafluoroethylene-propylene copolymer and which has a metal element content of 1.5% by weight or less; and (ii) silica which has a primary particle size of 0.5 &mgr;m or less and which has been treated to have a hydrophobic surface. Also disclosed is a method for producing the fluororubber molded article.

Abstract: An elastomer sealing material having low dielectric constant and low dielectric dissipation, which is satisfactory with both of resistance to oxygen plasma and non-adhesion to quartz and can be applied to apparatus utilizing microwaves, is disclosed. The plasma-resistant fluorine-based elastomer sealing material comprises a fluorine-based elastomer having a divalent perfluoropolyether or divalent perfluoroalkylene structure in the main chain thereof and having two or more hydrosilyl groups and addition-reactive alkenyl groups in the terminals or side chains thereof, and a polymer having two or more hydrosilyl groups in the molecule and being capable of addition reacting with the alkenyl groups, the fluorine-based elastomer being crosslinked with the polymer.

Abstract: The present invention relates to a fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and (ii) a prepolymer of triallyl isocyanurate. Also disclosed is a method for producing the fluororubber molded article.

Abstract: An elastomer sealing material having low dielectric constant and low dielectric dissipation, which is satisfactory with both of resistance to oxygen plasma and non-adhesion to quartz and can be applied to apparatus utilizing microwaves, is disclosed. The plasma-resistant fluorine-based elastomer sealing material comprises a fluorine-based elastomer having a divalent perfluoropolyether or divalent perfluoroalkylene structure in the main chain thereof and having two or more hydrosilyl groups and addition-reactive alkenyl groups in the terminals or side chains thereof, and a polymer having two or more hydrosilyl groups in the molecule and being capable of addition reacting with the alkenyl groups, the fluorine-based elastomer being crosslinked with the polymer.

Abstract: In order to provide a spiral wound type gasket, in which centering of the gasket body is easy and a good sealing property at a low superficial pressure can be obtained, the spiral wound type gasket is constructed by winding a metal hoop member having an approximately V-shaped cross section and a filler member in a spiral, superposed on each other. In this gasket, an extremity bent portion of the V shape of the hoop member is directed towards the inner peripheral side and in this way it is possible to obtain a good centering and to prevent bulge-out of the filler member towards the interior of the pipe.