Diesel soot particulate filter cartridge

A multicartridge diesel soot particulate filter comprising a number of radial diesel soot particulate filter cartridges,

• wherein each radial diesel soot particulate filter cartridge has a central filter cartridge axis,
• wherein each filter cartridge comprises a porous structure,
• wherein said porous structure is coiled around said central filter cartridge axis,
• wherein said porous structure comprises non-sintered metal fibers,
• wherein said metal fibers have a roughness higher than 1.7, said roughness being defined as the ratio of the perimeter of a cross-section of one of the metal fibers to the perimeter of a cross-section of an imaginary fiber,
• wherein said imaginary fiber comprises a fiber having a circular radial cross-section identical in surface area to an average of the surface areas of cross-sections of the one of the metal fibers,
• wherein said multicatridge diesel soot particulate filter comprises a casing delimiting the outer boundary of a filter volume, said filter having a central filter axis, said casing having an inflow side and an outflow side defining an average flow direction, said average flow direction being substantially parallel to said central filter axis, said casing being gas impermeable in a radial direction, wherein the central filter cartridge axis of said filter cartridges is substantially parallel to said central filter axis.