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Sound absorbing materials do not absorb all frequencies to the same extent. In the acoustical design of a room it is important to know the whole absorption spectrum of the sound absorbing material to be used. 
For these materials, a general classification is used,
based on the sound absorption coefficient (αw).
This lets us compare the various materials considered.
However to define the quality of a sound absorbing material on the basis of a single parameter is to over-simplify; actually, materials with the same sound absorption coefficient αw can have completely different absorption spectra. The graph shows the sound absorption coefficients for different materials in relation to various frequencies: 
Why use noise absorbing coverings? |
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