Abstract: A method for preparing an exfoliated vermiculite, comprising the following steps: (a) a step of heating a non-exfoliated hydrated vermiculite at a temperature extending from 400 to 600° C. for a period extending from 3 hours to 7 hours, in this way generating a dehydrated vermiculite; and (b) a step of contacting the dehydrated vermiculite with a solution containing an intercalating agent capable of decomposing while generating gases.

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.

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: The open circular section gasket is not deformed under flattening while nevertheless ensuring the leaktightness of the two spaces to seal. Each contact surface (16) is slightly inclined and has a slightly offset projecting part (15) such that the summits of the two projecting parts define an axis that is offset with respect to the center line (A2) of the general circular shape of the gasket (10). When the gasket is flattened, the contact surfaces (16) tend to become parallel, the projecting parts (15) come closer to the center line (A2). Application to cases of static sealing.

Abstract: The open circular section gasket is not deformed under flattening while nevertheless ensuring the leaktightness of the two spaces to seal.

Abstract: The gasket makes it possible to maintain a high level of tightness, in spite of the low forces involved, through the use of a sheet of ductile material as outer envelope.

Abstract: The metal elastic gasket can tolerate considerable clamping forces without causing any degradation to sealing by possible deformation.

Abstract: This invention relates to a sealing O-ring of the composite metallic type with a metallic torus-shaped hollow central body (31), and at least one metallic sheet (32) surrounding this metallic body. The central body (31) is composed of a sequence forming a spiral spring with an overlap and laid out along the circumferences of meridian circles of the torus, forming a spiral spring being side by side but not touching each other.