GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
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
0.50
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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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12,5 + 12,5 mm · 358 mm | 0.50 | 0.32 | 0.22 | 0.32 | 0.42 | 0.63 | 0.66 | 0.66 | 0.77 | 0.80 | 0.80 | 0.64 | 0.59 | 0.50 | 0.41 | 0.38 | 0.38 | 0.40 | 0.41 |
Measured values as a table (1 measurement)
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