Method for producing a hollow body which is pressure-tight to a predetermined medium

A method for producing a hollow body that is pressure-tight for a predetermined medium, comprising:

• introducing the medium into at least one sub-cavity of at least one sub-body in a solid or partially solid state together with a container element that contains or holds the medium in the solid or partially solid state, from which container element the medium can escape in a liquid or gaseous state, wherein the container element is composed or at least partially composed of at least one of the group consisting of:
• a material having open pores and is embodied with closed-pore surfaces or open-pore surfaces;
• a water-soluble material that is suitable for bonding to corrosive ingredients in the medium during operation;
• and
• a hard paraffin, wax, or a wax/graphite mixture;
• and
• then using an integral joining method at ambient pressure to integrally join at least two of the sub-bodies, which when joined form the hollow body that contains the medium in a gaseous and/or liquid state during an intended use of the hollow body.