Anechoic sponge is a kind of three-dimensional network structure with very high opening rate (the opening rate of the anechoic sponge is 9kg / m3, over 99%), which makes it easy and effective for sound waves to enter the deep layer of the sponge and transform into a network. Vibration energy can be consumed and absorbed, and the reflected wave can be removed effectively. The sound absorption coefficient is as high as 0.95, which can effectively absorb the thunder from multiple angles. Reduce vibration. It has the common performance of noise elimination, heat insulation, flame retardant, high temperature resistance, light weight and so on. It has been widely used in construction decoration, transportation vehicles, water vessels, aerospace, mechanical and electrical equipment, industrial noise insulation and other fields

In addition to absorbing air sound, porous materials can also reduce the vibration caused by solid sound and cavity air sound. The sound insulation ability can be improved and the weight of the structure can be reduced by filling porous materials into the composite structure composed of various plate materials. A material that absorbs incident sound energy. Sound absorbing materials are mainly used to control and adjust the reverberation time in the room; It is used to reduce noise in noisy places to improve living environment and working conditions (see sound absorption and noise reduction); It is also widely used to reduce the noise of ventilation and air conditioning ducts.