Abstract: A flange connection for connecting e.g. two sections of a tube or pipe comprises two flanges and a sealing ring inserted into an annular sealing space defined by radial faces and axially extending peripheral walls between the flanges. The sealing ring has an annular main body and an outer periphery with a cross-sectional shape that has legs extending outwardly from the main body. These legs, in a condition prior to application of sealing pressure, are inclined away from each other and have rounded outer ends that abut both the radial faces and the peripheral walls defining the annular sealing space. The legs, in a condition where the flanges are forced against each other, are axially compressed and upset at least in a radial direction by plastic flow of material on the outer ends in sealing engagement with the axially extending peripheral walls.

Abstract: A flange connection for connecting e.g. two sections of a tube or pipe comprises two flanges and a sealing ring inserted into an annular sealing space defined by radial faces and axially extending peripheral walls between the flanges. The sealing ring has an annular main body and an outer periphery with a cross-sectional shape that has legs extending outwardly from the main body. These legs, in a condition prior to application of sealing pressure, are inclined away from each other and have rounded outer ends that abut both the radial faces and the peripheral walls defining the annular sealing space. The legs, in a condition where the flanges are forced against each other, are axially compressed and upset at least in a radial direction by plastic flow of material on the outer ends in sealing engagement with the axially extending peripheral walls.

Abstract: The invention relates to hollow bodies, whose internal surface is coated, to a coating method and to devices for carrying out said coating method to specifically adapt the physical characteristics, e.g. electrical conductivity, diffusion behavior or the chemical stability of hollow bodies, such as for example plastic tubes or flexible hoses, by coating their internal surface using a gas plasma to a thickness of between 5 and 1000 nm. The coatings are applied individually or as a sandwich and act bi-directionally. For example said coatings protect a medium in the interior of the hollow body from contamination by the surrounding area and by the material of the wall of the hollow body itself, or protect the surrounding area from the medium with an efficiency that has not previously been achieved, for said coatings prevent the medium from escaping through the wall of the hollow body.

Abstract: An ion implantation process uses exclusively photoresist masks to cover a substrate except in the regions to be implanted with ions. The photoresist masks are removed after each ion implantation by plasma etching.