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

Manville Micro-Aire Type 475 FSK coated duct board

Type 475 FSK – Micro-Aire

PTB reference data

Original description

Manville Micro-Aire Type 475 FSK coated duct board

Material properties

Manufacturer: Manville
Thickness: 1 inch, 1 1/2 inch
Wall distance: 0 mm, 25 mm

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 6 variants

αw
0.90

Frequency values

αp per ISO 11654

f (Hz)1252505001k2k4k
αp0.450.600.951.001.001.00

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CompareValue
1 1/2 inch0.47 lb/ft²25 mmαw0.90
1 1/2 inch0.47 lb/ft²0αw0.75
1 inch0.42 lb/ft²25 mmαw0.70
1 inch0.35 lb/ft²25 mmαw0.60
1 inch0.42 lb/ft²0αw0.55
1 inch0.35 lb/ft²0αw0.50

Dimensions: to 48 x 120 inches

Terms of use
Measured values as a table (6 measurements)
Manville Micro-Aire Type 475 FSK coated duct board: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-upαw125 Hz250 Hz500 Hz1000 Hz2000 Hz4000 Hz
1 inch · 0.35 lb/ft² · 00.500.060.220.610.861.001.04
1 inch · 0.42 lb/ft² · 00.550.010.230.670.981.051.06
1 1/2 inch · 0.47 lb/ft² · 00.750.110.450.991.111.091.07
1 inch · 0.35 lb/ft² · 25 mm0.600.460.300.580.851.001.03
1 inch · 0.42 lb/ft² · 25 mm0.700.290.420.701.001.061.08
1 1/2 inch · 0.47 lb/ft² · 25 mm0.900.460.580.951.101.081.09
Measured values as a table (6 measurements)

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