Abstract: A seal 1 having one or more lips 13 constituted of a molded rubber is described, wherein the lips 13 (the whole elastic body 3) have been formed so as to have a maximum value of loss tangent (tan &dgr;) of 0.40 or smaller in the temperature range of from 20 to 70° C.

Abstract: A linear guide apparatus includes a slider, a guide rail opposing the slider with a clearance provided therebetween, a plurality of rolling elements which are rotatably interposed there between, and a contact seal device for sealing an opening of the clearance. A side seal member of the contact seal device is made of a rubber material composition containing fluoro rubber. The rubber basically comprises at least one of copolymers that are vinylidenefluoride-tetrafluoroethylene-polypropylene terpolymer and tetrafluoroethylene-polypropylene copolymer.

Abstract: The present invention provides a rolling bearing having a prolonged life suitable for wheel, railway vehicle and steel rolling mill comprising a sealing member which exhibits fair sealing properties even under severe conditions. A rolling bearing comprising an outer ring having an outer raceway formed on the inner surface thereof, an inner ring having an inner raceway formed on the outer surface thereof, a plurality of rolling elements rollably provided between the outer ring and the inner ring, and a sealing member for sealing the axial opening of the space between the inner surface of the outer ring and the outer surface of the inner ring in which said rolling elements are provided, characterized in that the sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.

Abstract: A rubber composition containing a tetrafluoroethylene-propylene bipolymer and from 0.02 to 10 parts by weight of a liquid polybutadiene per 100 parts by weight of the tetrafluoroethylene-propylene bipolymer and a rubber sealing device in which the rubber composition is joined to a reinforcing member are described, by which long-life rubber sealing devices which are highly tolerant to liquids containing amine-based additives, for example, soluble-type synthetic cutting coolants and engine oils suitable for high-speed processing and can sustain favorable sealing performance over a long period of time and rubber compositions appropriate therefor are provided.

Abstract: A linear guide apparatus includes a slider, a guide rail opposing the slider with a clearance provided therebetween, a plurality of rolling elements which are rotatably interposed there between, and a contact seal device for sealing an opening of the clearance. A side seal member of the contact seal device is made of a rubber material composition containing fluoro rubber. The rubber basically comprises at least one of copolymers that are vinylidenefluoride-tetrafluoroethylene-polypropylene terpolymer and tetrafluoroethylene-polypropylene copolymer.

Abstract: A sealing device equipped with a lip made of a rubber material composition wherein the rubber material composition comprises 100 parts by weight of a tetrafluoroethylene-propylene copolymer and 0.02 to 10 parts by weight of an ethylene-propylene-based copolymer is described, by which a long life sealing device that is not deteriorated even when used under an environment where chemicals such as a cutting lubricant containing an additive adversely affecting rubbers contact the sealing device is provided.

Abstract: The present invention is to offer a rubber material composition excellent in an abrasion resistance and less to cause heat by friction, and is suitably used to sealing members of rolling devises to be used with grease lubrication under severe circumstances allowing water or dusts to much exist. The rubber material composition is fabricated with carboxylated acrylonitrile-butadiene rubber.