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
Rigid plenum liner
PTB reference data
Original description
Rigid plenum liner
Material properties
Manufacturer: Knauf Fiber Glass
Thickness: 1 inch, 1 1/2 inch, 2 inches
Wall distance: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
NRC
0.95
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 0.65 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 2 inches | 0.50 lb/ft² | NRC0.95 | |
| 1 1/2 inch | 0.37 lb/ft² | NRC0.85 | |
| 1 inch | 0.25 lb/ft² | NRC0.65 |
NRC: 0.95 (derived from ISO 354 lab data)
Dimensions: 24 or 48 x 36 to 120 inches
Distance: 0
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 inch · 0.25 lb/ft² · 0 | 0.65 | 0.13 | 0.24 | 0.56 | 0.83 | 0.92 | 0.98 |
| 1 1/2 inch · 0.37 lb/ft² · 0 | 0.85 | 0.19 | 0.41 | 0.89 | 1.02 | 1.03 | 1.04 |
| 2 inches · 0.50 lb/ft² · 0 | 0.95 | 0.33 | 0.67 | 1.07 | 1.07 | 1.03 | 1.06 |
Measured values as a table (3 measurements)
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