GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
Knauf D 127 acoustic design panel, perforated drywall, 12/25Q, 23%
D 127 perforation 12/25Q
PTB reference data
Original description
Knauf D 127 acoustic design panel, perforated drywall, 12/25Q, 23%
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in + 0.8 in mineral fiber
Wall distance: 2.4 in, 16 in
Perforation: 23%
Hole size: 0.5 in
Backing: 0.8 in mineral fiber, incl. standard non-woven
Mounting: on sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.85
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.70 | 0.90 | 0.80 | 0.85 | 0.70 | 0.75 |
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| Compare | Value | |
|---|---|---|
| 16 in | NRC0.85 | |
| 2.4 in | NRC0.75 |
NRC: 0.85 (derived from ISO 354 lab data)
Weight / density: <15 kg / m²
Dimensions: 47 in x 79 in
Measured values as a table (2 measurements)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12,5 mm + 20 mm Mineralfaser · <15 kg / m² · 400 mm | 0.85 | 0.50 | 0.65 | 0.95 | 0.93 | 0.96 | 0.85 | 0.80 | 0.76 | 0.88 | 0.90 | 0.88 | 0.83 | 0.78 | 0.70 | 0.68 | 0.70 | 0.79 |
| 12,5 mm + 20 mm Mineralfaser · <15 kg / m² · 60 mm | 0.75 | 0.16 | 0.28 | 0.20 | 0.40 | 0.47 | 0.65 | 0.95 | 1.06 | 1.12 | 1.10 | 0.89 | 0.80 | 0.67 | 0.54 | 0.52 | 0.61 | 0.67 |
Measured values as a table (2 measurements)
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