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 SuperDuct Type 475 FSK, coated duct board
Type 475 FSK – SuperDuct
PTB reference data
Original description
Manville SuperDuct Type 475 FSK, coated duct board
Material properties
Manufacturer: Manville
Thickness: 1 inch, 1 1/2 inch
Wall distance: 0 in, 1 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 6 variants
NRC
0.95
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.60 | 1.00 | 1.00 | 1.00 | 0.90 |
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| Compare | Value | |||
|---|---|---|---|---|
| 1 1/2 inch | 0.47 lb/ft² | 0 | NRC0.95 | |
| 1 1/2 inch | 0.47 lb/ft² | 1 in | NRC0.95 | |
| 1 inch | 0.37 lb/ft² | 1 in | NRC0.80 | |
| 1 inch | 0.42 lb/ft² | 1 in | NRC0.80 | |
| 1 inch | 0.37 lb/ft² | 0 | NRC0.80 | |
| 1 inch | 0.42 lb/ft² | 0 | NRC0.75 |
NRC: 0.95 (derived from ISO 354 lab data)
Dimensions: to 48 x 120 inches
Measured values as a table (6 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 inch · 0.37 lb/ft² · 0 | 0.80 | 0.11 | 0.29 | 0.81 | 1.05 | 1.09 | 1.01 |
| 1 inch · 0.42 lb/ft² · 0 | 0.75 | 0.09 | 0.22 | 0.78 | 1.00 | 1.08 | 1.02 |
| 1 1/2 inch · 0.47 lb/ft² · 0 | 0.95 | 0.17 | 0.61 | 1.03 | 1.12 | 1.02 | 0.89 |
| 1 inch · 0.37 lb/ft² · 25 mm | 0.80 | 0.52 | 0.40 | 0.74 | 1.03 | 1.06 | 1.02 |
| 1 inch · 0.42 lb/ft² · 25 mm | 0.80 | 0.52 | 0.37 | 0.70 | 1.01 | 1.07 | 1.01 |
| 1 1/2 inch · 0.47 lb/ft² · 25 mm | 0.95 | 0.54 | 0.58 | 1.02 | 1.14 | 1.01 | 0.92 |
Measured values as a table (6 measurements)
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