Acoustic IndexAcoustic Index
Mineral woolHighly absorbent

Data source

PTB reference data

Physikalisch-Technische Bundesanstalt

Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994

Value from the PTB table, not verified

Fiberglass duct liner with surface coating

Ultralite

PTB reference data

Original description

Fiberglass duct liner with surface coating

Material properties

Manufacturer: CertainTeed Corp.
Thickness: 1 in, 1.5 in, 2 in
Wall distance: 0 in, 1 in
Surface: with surface coating

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 18 variants

NRC
0.90

Frequency values

αp per octave band

f (Hz)1252505001k2k4k
αp0.350.800.951.000.950.95

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CompareValue
2 inches0.5 lb/ft²1 inNRC0.90
2 inches0.34 lb/ft²1 inNRC0.90
2 inches0.50 lb/ft²0NRC0.95
2 inches0.24 lb/ft²1 inNRC0.85
1 1/2 inch0.37 lb/ft²1 inNRC0.80
2 inches0.34 lb/ft²0NRC0.85
1 1/2 inch0.25 lb/ft²1 inNRC0.80
2 inches0.24 lb/ft²0NRC0.80
1 1/2 inch0.18 lb/ft²1 inNRC0.75
1 1/2 inch0.37 lb/ft²0NRC0.80
1 1/2 inch0.18 lb/ft²0NRC0.70
1 1/2 inch0.25 lb/ft²0NRC0.75
1 inch0.17 lb/ft²1 inNRC0.65
1 inch0.25 lb/ft²1 inNRC0.70
1 inch0.17 lb/ft²0NRC0.60
1 inch0.12 lb/ft²1 inNRC0.65
1 inch0.12 lb/ft²0NRC0.60
1 inch0.25 lb/ft²0NRC0.60

NRC: 0.90 (derived from ISO 354 lab data)

Dimensions: roll

Terms of use
Measured values as a table (18 measurements)
Fiberglass duct liner with surface coating: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-upNRC125 Hz250 Hz500 Hz1000 Hz2000 Hz4000 Hz
1 inch · 0.12 lb/ft² · 25 mm0.650.340.420.470.840.800.79
1 1/2 inch · 0.18 lb/ft² · 25 mm0.750.290.550.720.850.890.89
2 inches · 0.24 lb/ft² · 25 mm0.850.320.710.830.910.951.01
1 inch · 0.17 lb/ft² · 25 mm0.650.230.470.570.740.850.87
1 1/2 inch · 0.25 lb/ft² · 25 mm0.800.330.570.790.910.920.89
2 inches · 0.34 lb/ft² · 25 mm0.900.390.690.920.980.931.00
1 inch · 0.25 lb/ft² · 25 mm0.700.230.470.610.790.880.91
1 1/2 inch · 0.37 lb/ft² · 25 mm0.800.370.630.800.900.890.90
2 inches · 0.5 lb/ft² · 25 mm0.900.360.790.960.990.930.97
1 inch · 0.12 lb/ft² · 00.600.100.280.500.700.820.83
1 1/2 inch · 0.18 lb/ft² · 00.700.200.400.710.860.910.85
2 inches · 0.24 lb/ft² · 00.800.220.490.830.890.890.91
1 inch · 0.17 lb/ft² · 00.600.100.290.590.720.830.84
1 1/2 inch · 0.25 lb/ft² · 00.750.200.420.800.930.930.88
2 inches · 0.34 lb/ft² · 00.850.240.570.900.950.950.96
1 inch · 0.25 lb/ft² · 00.600.050.250.570.780.870.89
1 1/2 inch · 0.37 lb/ft² · 00.800.200.460.820.940.950.91
2 inches · 0.50 lb/ft² · 00.950.270.721.041.020.960.92
Measured values as a table (18 measurements)

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