Metal foam is a special metal composite material with foam air holes. According to its distinctive structural characteristics, foam metal has a series of excellent advantages such as low relative density, good fire resistance, good noise and sound reduction performance and can digest and absorb radio waves, etc. It is a new class of materials that gradually develops along with people’s high-tech development trend up commonly used in aerospace, petrochemical equipment and a series of industrial production development design.

Porosity
Porosity is the ratio of the volume of all porosity in the porous structure body to the total volume of the porous structure body, often considering the size of the interstitial space of the porous structure body.
The porosity of metal foam often achieves more than 90%, and has a certain compressive strength and bending stiffness of porous structure metal materials. This kind of metal has high porosity, and the diameter of porosity reaches to mm level.