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Metallic foams are available in aluminum, steel, copper, and nickel. They are the next generation of porous functional materials, each with a distinct structure and set of properties. High specific surface area, low density, ultralightweight, good thermal and sound insulation, and ability to absorb electromagnetic waves are examples. These porous foam metals have a wide range of applications in aerospace, aviation, transportation, environmental protection, energy, biological, and other high-tech or general industrial fields.