metal fibers are converted into fiber media either as non-woven fleece or sintered structures composed of fibers ranging from 1.5 to 80 μm in diameter. These porous metal fiber media have been used for their uniqueness in highly demanding applications. The benefit of having the combination of an outstanding permeable material (porosities up to 90% for sintered and up to 99% for non-woven structures) combined with high corrosion and temperature resistance is highly valued. The sintered porous structure has no binder as the individual fibers are strongly bonded together by inter-metallic diffusion bonding. 3D sintered structures have also become a standard product. Some of the latest developments are relate to filtration media using a combination of metallic and non-metallic fibers, allowing the best of both worlds. Short fibers