Self Adhesive Acoustic Foam Panel Data Sheet Absorption Coefficients (As Per ASTM C423-90a) 125 Hz
250 Hz
500 Hz
1 KHz
2 KHz
4 KHz
NRC
1” Thickness
0.07
0.25
0.60
0.94
0.97
1.08
0.7
1.5” Thickness
0.18
0.44
0.96
1.14
1.18
1.19
0.95
2” Thickness
0.16
0.62
1.10
1.20
1.21
1.22
1.05
4” Thickness
0.31
0.85
1.25
1.14
1.06
1.09
1.10