Ratings according to ISO 11654
Weighted sound absorption coefficient: 0.45
Sound absorption class: D
Rating according to ASTM C423 – 99
Noise Reduction Coefficient = 0.45 -0.95
Sound Absorption Average = 0.58
It is strongly recommended to use this single number rating in combination with the complete sound absorption coefficient curve. Sound absorption coefficients according to ISO 354 measurement of sound absorption in a reverberation room.