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
Knauf Fiber Glass duct wrap Type KN
Type KN
PTB reference data
Original description
Knauf Fiber Glass duct wrap Type KN
Material properties
Manufacturer: Knauf Fiber Glass
Thickness: 1 1/2 inch, 2 inch
Wall distance: 1 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 4 variants
NRC
0.85
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.45 | 0.75 | 0.85 | 0.85 | 0.90 | 0.90 |
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| Compare | Value | ||
|---|---|---|---|
| 2 inch | 0.38 lb/ft² | NRC0.85 | |
| 2 inch | 0.17 lb/ft² | NRC0.85 | |
| 1 1/2 inch | 0.13 lb/ft² | NRC0.80 | |
| 1 1/2 inch | 0.25 lb/ft² | NRC0.70 |
NRC: 0.85 (derived from ISO 354 lab data)
Dimensions: roll
Distance: 1 in
Measured values as a table (4 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 1/2 inch · 0.25 lb/ft² · 25 mm | 0.70 | 0.35 | 0.64 | 0.69 | 0.76 | 0.79 | 0.81 |
| 2 inch · 0.38 lb/ft² · 25 mm | 0.85 | 0.43 | 0.74 | 0.83 | 0.87 | 0.88 | 0.88 |
| 1 1/2 inch · 0.13 lb/ft² · 25 mm | 0.80 | 0.41 | 0.69 | 0.77 | 0.86 | 0.90 | 0.85 |
| 2 inch · 0.17 lb/ft² · 25 mm | 0.85 | 0.45 | 0.78 | 0.88 | 0.90 | 0.91 | 0.91 |
Measured values as a table (4 measurements)
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