GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerangabe www.knauf.de
Knauf Twin D 123 acoustic design panel, 8/18 perforation
Knauf Twin – D 123 perforation 8/18
PTB reference data
Original description
Knauf Twin D 123 acoustic design panel, 8/18 perforation
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 12.5 + 12.5 mm
Wall distance: 358 mm
Perforation: 18%
Hole size: 8 mm
Backing: 20 mm mineral fiber insulation backing incl. standard non-woven
Mounting: on sub-frame
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.64
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.50 | 0.85 | 0.95 | 0.70 | 0.60 |
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Method (354): Measured