GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerangabe www.knauf.de
Knauf Twin D 123 acoustic design panel
Knauf Twin – D 123 perforation 12/20/35
PTB reference data
Original description
Knauf Twin D 123 acoustic design panel
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 12.5 mm + 12.5 mm
Wall distance: 358 mm
Hole size: 12 mm, 20 mm, 35 mm
Backing: 20 mm mineral fiber insulation
Up to fire class: F30A
Mounting: on sub-frame
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.51
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.55 | 0.75 | 0.70 | 0.45 | 0.40 |
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Method (354): Measured