Fiberglass, Rockwool, Polyester, Cotton, and Sheep Absorption Coefficients:
http://www.bobgolds.com/AbsorptionCoefficients.htm
Absorption Coefficients α of Building Materials and Finishes :
http://www.sengpielaudio.com/calculator-RT60Coeff.htm
Wall Materials 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
Brick: unglazed 0.03 0.03 0.03 0.04 0.05 0.07
Brick: unglazed & painted 0.01 0.01 0.02 0.02 0.02 0.03
Concrete block - coarse 0.36 0.44 0.31 0.29 0.39 0.25
Concrete block - painted 0.10 0.05 0.06 0.07 0.09 0.08
Curtain: 10 oz/sq yd fabric molleton 0.03 0.04 0.11 0.17 0.24 0.35
Curtain: 14 oz/sq yd fabric molleton 0.07 0.31 0.49 0.75 0.70 0.60
Curtain: 18 oz/sq yd fabric molleton 0.14 0.35 0.55 0.72 0.70 0.65
Fiberglass: 2'' 703 no airspace 0.22 0.82 0.99 0.99 0.99 0.99
Fiberglass: spray 5'' 0.05 0.15 0.45 0.70 0.80 0.80
Fiberglass: spray 1'' 0.16 0.45 0.70 0.90 0.90 0.85
Fiberglass: 2'' rolls 0.17 0.55 0.80 0.90 0.85 0.80
Foam: Sonex 2'' 0.06 0.25 0.56 0.81 0.90 0.91
Foam: SDG 3'' 0.24 0.58 0.67 0.91 0.96 0.99
Foam: SDG 4'' 0.33 0.90 0.84 0.99 0.98 0.99
Foam: polyur. 1'' 0.13 0.22 0.68 1.00 0.92 0.97
Foam: polyur. 1/2'' 0.09 0.11 0.22 0.60 0.88 0.94
Glass: 1/4'' plate large 0.18 0.06 0.04 0.03 0.02 0.02
Glass: window 0.35 0.25 0.18 0.12 0.07 0.04
Plaster: smooth on tile/brick 0.013 0.015 0.02 0.03 0.04 0.05
Plaster: rough on lath 0.02 0.03 0.04 0.05 0.04 0.03
Marble/Tile 0.01 0.01 0.01 0.01 0.02 0.02
Sheetrock 1/2" 16" on center 0.29 0.10 0.05 0.04 0.07 0.09
Wood: 3/8'' plywood panel 0.28 0.22 0.17 0.09 0.10 0.11
http://www.bobgolds.com/AbsorptionCoefficients.htm
Absorption Coefficients α of Building Materials and Finishes :
http://www.sengpielaudio.com/calculator-RT60Coeff.htm
Wall Materials 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
Brick: unglazed 0.03 0.03 0.03 0.04 0.05 0.07
Brick: unglazed & painted 0.01 0.01 0.02 0.02 0.02 0.03
Concrete block - coarse 0.36 0.44 0.31 0.29 0.39 0.25
Concrete block - painted 0.10 0.05 0.06 0.07 0.09 0.08
Curtain: 10 oz/sq yd fabric molleton 0.03 0.04 0.11 0.17 0.24 0.35
Curtain: 14 oz/sq yd fabric molleton 0.07 0.31 0.49 0.75 0.70 0.60
Curtain: 18 oz/sq yd fabric molleton 0.14 0.35 0.55 0.72 0.70 0.65
Fiberglass: 2'' 703 no airspace 0.22 0.82 0.99 0.99 0.99 0.99
Fiberglass: spray 5'' 0.05 0.15 0.45 0.70 0.80 0.80
Fiberglass: spray 1'' 0.16 0.45 0.70 0.90 0.90 0.85
Fiberglass: 2'' rolls 0.17 0.55 0.80 0.90 0.85 0.80
Foam: Sonex 2'' 0.06 0.25 0.56 0.81 0.90 0.91
Foam: SDG 3'' 0.24 0.58 0.67 0.91 0.96 0.99
Foam: SDG 4'' 0.33 0.90 0.84 0.99 0.98 0.99
Foam: polyur. 1'' 0.13 0.22 0.68 1.00 0.92 0.97
Foam: polyur. 1/2'' 0.09 0.11 0.22 0.60 0.88 0.94
Glass: 1/4'' plate large 0.18 0.06 0.04 0.03 0.02 0.02
Glass: window 0.35 0.25 0.18 0.12 0.07 0.04
Plaster: smooth on tile/brick 0.013 0.015 0.02 0.03 0.04 0.05
Plaster: rough on lath 0.02 0.03 0.04 0.05 0.04 0.03
Marble/Tile 0.01 0.01 0.01 0.01 0.02 0.02
Sheetrock 1/2" 16" on center 0.29 0.10 0.05 0.04 0.07 0.09
Wood: 3/8'' plywood panel 0.28 0.22 0.17 0.09 0.10 0.11