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Acoustic materials

The sound originates from the vibration of the object, which causes the vibration of the adjacent air to form an acoustic wave and propagates around in the air medium.

When sound is transmitted to the surface of the component material, part of the acoustic energy is reflected, a part penetrates the material, and a part is rubbed with the surrounding medium due to the vibration or sound of the component material, and the sound energy is converted into heat energy, and the sound energy is lost. 

That is, the sound is usually absorbed by the material.

Grooved Acoustic Panel