Abstract: A seal including an outer envelope that may be made of PTFE, and an inner core including an air-permeable sack partially filled with a granular fluid. When bearing surfaces that are to be sealed are near one another, the sack is squashed, an upper volume of air escapes to the outside, and grains transmit a substantial contact pressure between lips of the envelope and the bearing surfaces. They may have moved during the squashing movement so as to even out the pressure by redistributing themselves in the sack even if there is a significant lack of flatness between the bearing surfaces.

Abstract: A sealing joint comprises, compressed between two parts, a stack of flexible strips separated by offset supports (9); an envelop (1) surrounds this structure (7) and ensures its sealing. Under compression, the strips distort around the supports becoming very stiff for little distortion. Thus, we can rightly be wary of the consequences regarding the relief of strain on the material, notably at high temperatures.

Abstract: The seal can be used at high temperature. It is composed of a central flexible graphite core (10) maintained in its shape by two metal cups (12) that do not touch. It is all surrounded by a tight sheath (15) enabling the flexible core (10) to be maintained in a neutral atmosphere such as a partial vacuum or a neutral gas.

Abstract: A sealing joint comprises, compressed between two parts, a stack of flexible strips separated by offset supports (9); an envelop (1) surrounds this structure (7) and ensures its sealing. Under compression, the strips distort around the supports becoming very stiff for little distortion. Thus, we can rightly be wary of the consequences regarding the relief of strain on the material, notably at high temperatures.