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As technology places ever more complex demands on manufacturing processes, so the need for greater integrity is imposed on components. The past 30 years have seen major advances in all areas, in particular in sealing technology.
Developments that are based around the metal-to-metal sealing concept have enabled the nuclear power industry to meet stringent safety demands, and also help the semiconductor industry to achieve the high temperatures and ultrahigh vacuum levels essential to increase yields.
The challenge now is for design engineers to embrace the technology and benefit from its many advantages.
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## General news shown in Figure . The seal is self-closing, so that in case of a buffer gas failure the seal is hydraulically closed on the product side. The preferred design ensures that the counterfaees do not change their position in case of a pressure reversal. Antimony impregnated carbon/sili
properties against oxygen. It is melt-blended with a liquid polybutene oil plasticizer in an amount insufficient to render the plasticized elastomer tacky. If made tacky, enough 'de-tackifier' is used to allow the product to be formed into a removable seal. The TPE may be a conventional thermoplasti