Abstract: A filling material formed into a device for inhibiting an explosion of a fuel container includes an expanded metal sheet being perforated with evenly spaced slits extending parallel in longitudinal direction of the bank and stretched transversely to the longitudinal extension to form openings in the sheet.

Abstract: Gas- and/or liquid-permeable filter material is formed from a sheetlike web material. The sheetlike web material is upset or gathered transversely to its longitudinal extent in order to form a wavy structure. A device produces a filter material of this type includes at least two profile rollers located opposite one another being disposed, as seen in the conveying direction of the sheetlike web material, downstream of at least two embossing rollers located opposite one another. The rotational speed of the embossing rollers and the profile rollers and/or the distance between the profile rollers is capable of being set for the purpose of upsetting or gathering the web material led through between the embossing and profile rollers. In addition, a method produces a filter material of this type. The sheetlike web material is upset or gathered continuously.