Absorption Coefficients - sengpielaudio
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Absorption Coefficients α of Building Materials and Finishes

Floor Materials 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
             
concrete or tile 0.01 0.01 0.15 0.02 0.02 0.02
linoleum/vinyl tile on concrete 0.02 0.03 0.03 0.03 0.03 0.02
wood on joists 0.15 0.11 0.10 0.07 0.06 0.07
parquet on concrete 0.04 0.04 0.07 0.06 0.06 0.07
carpet on concrete 0.02 0.06 0.14 0.37 0.60 0.65
carpet on foam 0.08 0.24 0.57 0.69 0.71 0.73
             
 
Seating Materials 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
             
fully occupied - fabric upholstered 0.60 0.74 0.88 0.96 0.93 0.85
occupied wooden pews 0.57 0.61 0.75 0.86 0.91 0.86
empty - fabric upholstered 0.49 0.66 0.80 0.88 0.82 0.70
empty metal/wood seats 0.15 0.19 0.22 0.39 0.38 0.30
             
 
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
             
 
Ceiling Materials 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
             
Acoustic Tiles 0.05 0.22 0.52 0.56 0.45 0.32
Acoustic Ceiling Tiles 0.70 0.66 0.72 0.92 0.88 0.75
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
wood 0.15 0.11 0.10 0.07 0.06 0.07
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
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
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
             
 
Miscellaneous Material 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
             
Water 0.008 0.008 0.013 0.015 0.020 0.025
People (adults) 0.25 0.35 0.42 0.46 0.5 0.5
             

1 ounce / square yard = 0,0339 kg/m2 or 1 kg/m2 = 1,6388 oz/yd2

More tables and charts of absorption coefficients:

http://www.bobgolds.com/AbsorptionCoefficients.htm
http://www.ptb.de/en/org/1/17/173/datenbank.htm
http://www.bobgolds.com/Sabin.htm


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