Acoustic Properties
 
FIBROUS ABSORBER
ABSORPTION COEFFICIENTS  
MATERIAL
Density
Thickness
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
Fibreglass Blanket 14-25
14kg/m³
25 mm
0.15
0.25
0.35
0.45
0.45
0.50
0.40
Fibreglass Blanket 14-50
50 mm
0.35
0.50
0.65
0.70
0.70
0.70
0.65
Fibreglass Blanket 20-25
20kg/m³
25 mm
0.20
0.35
0.45
0.55
0.60
0.65
0.50
Fibreglass Blanket 120-50
50 mm
0.25
0.50
0.70
0.80
0.80
0.80
0.80
Fibreglass Blanket 20-75
75 mm
0.35
0.60
0.85
0.95
0.90
0.95
0.85
Fibreglass Blanket 20-100*
100 mm
0.50
0.85
1.00
0.95
0.95
1.00
0.95
Fibreglass Blanket 25-25
25kg/m
25 mm
0.15
0.30
0.50
0.65
0.75
0.75
0.55
Fibreglass Blanket 25-50
50 mm
0.25
0.50
0.70
0.80
0.80
0.80
0.70
Fibreglass Blanket 25-75*
75 mm
0.40
0.65
0.90
1.00
0.95
1.00
0.90
Fibreglass Blanket 25-100
100 mm
0.50
1.00
1.10
1.05
1.05
1.05
1.00
Fibreglass Blanket 32-25
32kg/m³
25 mm
0.15
0.25
0.50
0.65
0.80
0.80
0.55
Fibreglass Blanket 32-50*
50 mm
0.30
0.50
0.80
0.95
0.90
0.90
0.80
Fibreglass Blanket 32-75
75 mm
0.20
0.55
0.90
1.00
1.00
1.00
0.90
Fibreglass Blanket 32-100
100 mm
0.50
1.00
1.10
1.05
1.05
1.05
1.05
Fibreglass Blanket 35-25*
35kg/m³
25 mm
0.08
0.34
0.64
0.81
0.91
0.90
0.70
Fibreglass Blanket 35-50*
50 mm
0.45
0.85
1.00
0.95
0.95
1.00
0.90
Fibreglass Blanket 40-25
40kg/m³
25 mm
0.10
0.20
0.45
0.65
0.80
0.80
0.55
Fibreglass Blanket 40-50
50 mm
0.30
0.55
0.90
0.95
0.95
0.95
0.85
Fibreglass Blanket 40-75
75 mm
0.25
0.60
0.95
1.05
1.05
1.00
0.95
Fibreglass Blanket 40-100
100 mm
0.45
1.05
1.15
1.05
1.05
1.05
1.05
Fibreglass Blanket 48-25
48kg/m³
25 mm
0.15
0.35
0.60
0.75
0.85
0.95
0.65
Fibreglass Blanket 48-50
50 mm
0.30
0.55
0.90
0.95
0.95
0.95
0.90
Fibreglass Blanket 48-75
75 mm
0.40
0.80
1.15
1.10
1.05
1.05
1.05
Fibreglass Blanket 48-100
100 mm
0.50
1.10
1.15
1.10
1.10
1.05
1.10

 

SONEX(tm) ACOUSTIC FOAMS
ABSORPTION COEFFICIENTS  
SONEX Panels
 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
SONEXone - 2"
0.11
0.33
0.85
1.05
1.09
1.06
0.85
SONEXvalueline - 1.5"
0.08
0.29
0.73
0.94
0.97
0.89
0.75
SONEXpyramid - 2"
0.07
0.32
0.78
1.00
0.97
1.08
0.80
SONEXmini - 1"
0.11
0.17
0.40
0.72
0.76
0.91
0.50
SONEX Specialties
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
SONEXtextile - 2"
0.19
0.73
1.20
1.17
1.08
1.28
1.05
SONEXmetal - 2" H
0.13
0.41
1.02
1.18
1.18
1.13
0.95
SONEX Wedges
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
SONEXsuper - 6"
0.18
0.86
1.22
1.24
1.14
1.20
1.10
SONEX Baffles (in Sabine)
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
SONEXvalueline
1.00
5.40
10.80
16.30
18.70
24.00
12.80
SONEXwet
1.90
5.00
10.20
15.50
16.30
19.50
11.75
SONEX Prospec
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
SONEXprospec foam
0.00
0.26
1.01
0.82
0.68
0.60
0.70
SONEXcomposite
0.13
0.60
0.81
0.97
1.00
0.90
0.85
SONEX Curtains
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
SONEXcurtain BS
0.12
0.59
0.90
0.99
0.92
0.74
0.85
SONEXcurtain BB
0.12
0.52
0.84
0.98
0.90
0.68
0.80
SONEXcurtain QA-1
0.09
0.28
0.74
0.58
0.38
0.25
0.50
SONEXcurtain QA-2
0.14
0.55
0.96
0.73
0.36
0.25
0.65

 

GENERAL ABSORBERS
ABSORPTION COEFFICIENTS  
MATERIAL
 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
CARPET: INDOOR/OUTDOOR
0.01
0.02
0.06
0.15
0.25
0.45
0.12
CARPET: 3mm PILE HEIGHT
0.05
0.05
0.1
0.2
0.3
0.4
0.16
CARPET: 6mm PILE HEIGHT
0.05
0.1
0.15
0.3
0.5
0.55
0.26
CARPET: 4mm PILE HEIGHT
0.05
0.1
0.1
0.3
0.4
0.5
0.23
CARPET: 7mm PILE HEIGHT
0.05
0.15
0.3
0.4
0.5
0.6
0.34
CARPET: HEAVY ON CONCRETE
0.02
0.06
0.14
0.37
0.6
0.65
0.29
CARPET: HEAVY ON 40 OZ HAIRFELT OR FOAM
0.08
0.24
0.57
0.69
0.71
0.73
0.55
CUTTING WEDGE 50mm
0.24
0.31
0.69
0.94
0.95
0.96
0.72
CUTTING WEDGE 75mm
0.24
0.58
0.67
0.91
0.96
0.99
0.78
CUTTING WEDGE 100mm
0.33
0.9
0.84
0.99
0.98
0.99
0.93
CUTTING WEDGE 150mm
0.52
1
0.88
1
1
1
0.97
FIBREGLASS BLANKET: 50mm
0.17
0.55
0.80
0.90
0.85
0.80
0.59
FOAM: POLYURETHANE 25mm
0.09
0.11
0.22
0.60
0.88
0.94
0.71
FOAM: POLYURETHANE 25mm
0.13
0.22
0.68
1
0.92
0.97
0.73
FOAM: SONORA 12mm
0.06
0.13
0.47
0.91
0.94
0.78
0.61
FOAM: SONORA 25mm
0.1
0.46
0.93
1
1
0.85
0.85
FOAM: SONORA 40mm
0.15
0.82
0.99
1
0.97
0.9
0.95
FOAM: SONORA 50mm
0.39
0.98
1
1
1
1
0.99
FOAM: SONEX 50mm
0.06
0.25
0.56
0.81
0.90
0.91
0.71
DRAPERY FABRIC 10OZ/SQ YD FLAT AGAINST WALL
0.04
0.05
0.11
0.18
0.3
0.35
0.16
DRAPERY FABRIC 14OZ/SQ YD FLAT AGAINST WALL
0.05
0.07
0.13
0.22
0.32
0.35
0.18
LIGHT COTTON DRAPES 14OZ/SQ YD DRAPED TO 7/8 AREA
0.03
0.12
0.15
0.27
0.37
0.42
0.23
LIGHT COTTON DRAPES 14OZ/SQ YD DRAPED TO 3/4 AREA
0.04
0.23
0.4
0.57
0.53
0.4
0.43
LIGHT COTTON DRAPES 14OZ/SQ YD DRAPED TO 1/2 AREA
0.07
0.37
0.49
0.81
0.65
0.54
0.58
MEDIUM VELOUR DRAPES 14OZ/SQ YD DRAPED TO 1/2 AREA
0.07
0.31
0.49
0.75
0.7
0.6
0.56
HEAVY VELOUR 18OZ/SQ YD DRAPED TO 1/2 AREA
0.14
0.35
0.55
0.72
0.7
0.65
0.58

 

FLOORS
ABSORPTION COEFFICIENTS  
MATERIAL
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
CONCRETE OR TERRAZZO (SEALED OR PAINTED)
0.01
0.01
0.02
0.02
0.02
0.02
0.02
CONCRETE OR TERRAZZO (UNPAINTED, ROUGH FINISH)
0.01
0.02
0.04
0.06
0.08
0.1
0.05
MARBLE OR GLAZED TILE
0.01
0.01
0.01
0.01
0.02
0.02
0.01
LINOLEUM/ASPHALT TILE ON CONCRETE
0.02
0.03
0.03
0.03
0.03
0.02
0.03
WOOD PARQUET ON CONCRETE
0.04
0.04
0.07
0.06
0.06
0.07
0.06
WOOD FLOORING ON JOISTS
0.15
0.11
0.1
0.07
0.06
0.07
0.09
CARPET: INDOOR/OUTDOOR
0.01
0.02
0.06
0.15
0.25
0.45
0.12
CARPET: 3mm PILE HEIGHT
0.05
0.05
0.1
0.2
0.3
0.4
0.16
CARPET: 4mm PILE HEIGHT
0.05
0.1
0.1
0.3
0.4
0.5
0.23
CARPET: 6mm PILE HEIGHT
0.05
0.1
0.15
0.3
0.5
0.55
0.26
CARPET: 7mm PILE HEIGHT
0.05
0.15
0.3
0.4
0.5
0.6
0.34
CARPET: HEAVY ON CONCRETE
0.02
0.06
0.14
0.37
0.6
0.65
0.29
CARPET: HEAVY ON 40 OZ HAIRFELT OR FOAM
0.08
0.24
0.57
0.69
0.71
0.73
0.55

 

WALLS
ABSORPTION COEFFICIENTS  
MATERIAL
125 Hz
250 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
NRC
STC
2X4 1-LAYER 12mm GYP EA SIDE WO/INSULATION
0.29
0.1
0.06
0.05
0.04
0.04
0.06
30
2X4 1-LAYER 12mm GYP EA SIDE W/INSULATION
0.29
0.1
0.06
0.05
0.04
0.04
0.06
35
2X4 1-LAYER 8mm GYP EA SIDE WO/INSULATION
0.15
0.08
0.05
0.03
0.03
0.03
0.05
32
2X4 1-LAYER 8mm GYP EA SIDE W/INSULATION
0.15
0.08
0.05
0.03
0.03
0.03
0.05
37
2X4 1-LAYER 8mm GYP ONE SIDE/2-LAYERS OTHER W/INSULATION
0.02
0.02
0.03
0.04
0.04
0.03
0.03
40
2X4 2-LAYER 8mm GYP EA SIDE W/INSULATION
0.02
0.02
0.03
0.04
0.04
0.03
0.03
45
2X6 1-LAYER 8mm GYP EA SIDE W/INSULATION
0.15
0.08
0.05
0.03
0.03
0.03
0.05
39
2X6 1-LAYER 8mm GYP ONE SIDE/2-LAYERS OTHER W/INSULATION
0.02
0.02
0.03
0.04
0.04
0.03
0.03
41
2X6 2-LAYER 8mm GYP EA SIDE W/INSULATION
0.02
0.02
0.03
0.04
0.04
0.03
0.03
46
STAGGERED 2X4 1-LAYER 8mm GYP EA SIDE W/ INSULATION
0.15
0.08
0.05
0.03
0.03
0.03
0.05
51
ST