A flexible sealing material for threaded connections made from, in particular, a strip or threadlike PTFE-mono or multi-filament. The aim of the invention is to provide advantageous sealing conditions in which the filament is made from an undrawn PTFE which is strip or threadlike and which is modified with high pressure additives.

A curable precursor composition for a fluoroelastomers, methods of making fluoroelastomers, shaped articles and methods of making shaped articles.

A sealing body for dynamic applications has a Shore A hardness of between 60-100, comprising an elastomer material and carbon nanotubes distributed in the elastomer material in an amount of between 0.1-20 phr, with respect to the total amount of elastomer material.

The present invention provides a seal element made in an elastomeric composite, said material comprising an elastomeric polymer and a phase change material (PCM), wherein the PCM is able to provide thermal energy to the elastomeric polymer upon cooling to the phase transition point of the PCM.

To provide a fluoro-rubber composition whereby good hardness and good elongation are obtainable in a rubber article after cross-linking, and a cross-linked rubber article using the same. A fluoro-rubber composition comprising a fluoro-rubber, a hydrophobic silica and a cross-linking agent, wherein the hydrophobic silica is one having hydrophobized with hexamethyldisilazane or silicone oil, and the content of the hydrophobic silica is from 1 to 50 parts by mass and the content of the cross-linking agent is from 0.1 to 5 parts by mass, per 100 parts by mass of the fluoro-rubber; and a cross-linked rubber article obtained by cross-linking such a fluoro-rubber composition.

A composition for use as a swellable seal includes a base polymer, a super absorbent polymer, and a predetermined amount of cotton flock.

A spherical annular seal member 38 is used in an exhaust pipe joint and includes a spherical annular base member 36 defined by a cylindrical inner surface 32, a partially convex spherical surface 33, large- and small-diameter side annular end faces 34 and 35 of the partially convex spherical surface 33, and an outer layer 37 formed integrally on the partially convex spherical surface 33 of the spherical annular base member 36. The spherical annular base member 36 includes a reinforcing member made from a metal wire net 5 and a heat-resistant material containing expanded graphite filling meshes of the metal wire net 5 of this reinforcing member and compressed in such a manner as to be formed integrally with this reinforcing member in mixed form. In the outer layer 37, the reinforcing member, the heat-resistant material, and the solid lubricant are integrated in mixed form.

Provided are an elastomer composition including a first fluoroelastomer that is a copolymer of tetrafluoroethylene and perfluoro (alkoxyvinyl ether) and a second fluoroelastomer different from the first fluoroelastomer, and a sealing material including a crosslinked product of the elastomer composition.

A composition containing a fluorine-containing polymer and a silicon oxide represented by formula: SiO.sub.x, where 0<x<2. In a preferred embodiment, the composition contains a cross-linking agent. Also disclosed is a crosslinked product which may be a sealing material obtained by crosslinking the composition.

Provided is a seal material having excellent non-adherence to metal surfaces. The seal material is formed of a cross-linked rubber that is obtained through cross-linking of a cross-linkable rubber composition containing a binary fluororubber, a carbon material, and a polyol cross-linker. The carbon material includes one or more carbon nanotubes. The cross-linked rubber has an adhesion strength of 2 N or less to a metal surface after being heated at 250° C. for 70 hours while in contact with the metal surface.