Abstract: A sealing material in a closed circular shape for a dovetail groove formed on the surface of one member and to be abutted to the surface of the other member to seal a space between the both members, the sealing material for a dovetail groove in a cross-sectional shape includes: a bottom portion that comes into contact with the bottom face of the dovetail groove and that has corner portions formed slightly narrower than the narrowest width of the opening portion of the dovetail groove; a side protruding portion that is formed continuously from the bottom portion; an overhanging shoulder portion that is formed continuously from the side protruding portion; and a sealing protrusion that is formed continuously from the overhanging shoulder portion and that is protruded upward from the opening portion of the dovetail groove to seal a space between the both members in the case in which the sealing protrusion is abutted to the surface of the other member.

Abstract: A low-compression force metal gasket includes a coating layer containing a polymer material on at least a sealing surface of the gasket, and the coating layer satisfies the following conditions (1) to (3): (1) the layer comprises a resin, a rubber or a mixture thereof having an oxygen gas permeability coefficient at 25° C. of 10×10?12 to 0.1×10?12 (m2/s); (2) when the layer is compression deformed, the storage elastic modulus (E?) at 200° C. is in the range of 1.0×107 to 1.0×102 Pa; and (3) the coating layer has a thickness of 1 to 40 ?m. The gasket provides a high seal at a low clamping force.

Abstract: Provided is a filled fluororesin sheet excellent in stress relaxation properties, in particular stress relaxation properties at a high temperature. The filled fluororesin sheet includes a fluororesin and an inorganic filler having a revised Mohs hardness of not less than 8, in a fluororesin:inorganic filler volume ratio of 30-55:70-45 (wherein the total of the two is 100).

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A gate valve for vacuum capable of preventing a seal member from being cracked or particles from being produced due to a stress concentration even if the seal member is repeatedly compressed in the state that the adhesive agent is separated from the open side of a seal member mounting groove and capable of suppressing particles from being produced due to the rub of the seal top part with the seal surface.

Abstract: Provided are a functional molded article having sufficient flexibility and moldability and also sufficiently having the function of a functional particle, and a method for producing the same. The functional molded article is formed by molding a mixture containing a functional particle, a binder, and a fibrous substance.

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: In a vacuum gate valve, a seal member for sealing a gate opening part is bonded to an outer edge part of a planar seal plate that is disposed in such a manner that the planar seal plate is opposed to a valve seat surface of the gate opening part and comes into contact with the valve seat surface. The seal member includes a vacuum seal part that is located on a side farther from the gate opening part and maintains the sealability of the gate opening part when the gate opening part is closed, and also includes a radical seal part that is located on a side closer to the gate opening part and that prevents the seal member from being affected by a treatment gas in the gate opening part when the gate opening part is closed. The vacuum seal part is made of a rubber elastic body, and the radical seal part is configured by providing a radical resistant body that is provided with an excellent radical resistance on the rubber elastic body.

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150° C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320° C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Abstract: A metal gasket includes an outer ring that is formed in a substantially C-shaped cross-section having an opening in a circumferential direction and an inner ring that is disposed inside the outer ring, wherein the inner ring is configured in a polygonal shape of a cross section, and a pair of corner portions opposing to each other in the inner ring are disposed on inner circumferential faces on the both sides of the opening in the outer ring.

Abstract: A composite sealing material to be installed in a sealing groove includes a first sealing member that is located on the outer peripheral side of the sealing groove and that is made of an elastic member; and a second sealing member that is located on the inner peripheral side of the sealing groove and that is made of a material harder than the first sealing member, wherein the first sealing member is provided with a crosswise protrusion formed projecting in a radial inner direction from a radial inner side of the almost central section of the thickness direction; the second sealing member is formed in an almost cross sectional C shape by flange portions and formed at the both ends and an inner wall portion in an almost linear shape for connecting the flange portions; and a space is ensured between the crosswise protrusion and the inner wall portion in an almost linear shape of the second sealing member in a state that the first sealing member and the second sealing member are assembled in an integrated manner.

Abstract: A dust seal is provided with a tubular fitting portion, a bush end surface abutting portion, a lip portion and a sealing projection integrally formed. The sealing projection is formed to project in an axially opposite direction to the lip portion from a radial inner section of the bush end surface abutting portion and abuts against a chamfered portion of a bush in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant between the bush and a connecting pin, the sealing projection can prevent a part of the lubricant from entering between an end surface of the bush and the bush end surface abutting portion of the dust seal to maintain a sealed state therebetween. In consequence, the dust seal can be stably held on the inner peripheral side of a boss member, preventing the pulling-out of the dust seal.

Abstract: Provided is a seal that can ensure a satisfactory sealing property and can be easily separated from a sealing surface even in the case in which the seal is used for a long period of time under the conditions of a high temperature and a high pressure. The seal includes a seal body mounted in a seal groove that is formed in a first member and a second member is made to be in pressure contact with the first member to form a sealing part. The sealing part that comes into contact with the second member at the entire surface of the sealing part is formed along the entire circumference of the outer peripheral surface of the seal. A step portion is formed on the outer peripheral surface of the seal in such a manner that an area of a contact surface is smaller for the sealing part as the contact area is closer to the bottom side of the seal groove.