The Noise Reduction Coefficient is ideally defined as the fraction of the randomly incident sound power absorbed by the surface of a material.  NRC ratings are determined per ASTM C423.  The higher an NRC rating, the more absorptive it is.  A simplified example may be: an NRC rating of 0.10 means that a material absorbs about 10% of the sound that comes in contact with it.  Most recycled rubber Ecore products will have an NRC rating between 0.05-0.20.

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