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, scattered perforation Plus
D 127 Lochung 12/20/35R
PTB reference data
Original description
Knauf D 127 acoustic design panel, scattered perforation Plus
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in
Wall distance: 2.4 in, 16 in
Perforation: 9.8%
Hole size: 0.5 in, 0.8 in, 1.4 in
Backing: Standard non-woven fiber
Mounting: on sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.45
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.30 | 0.75 | 0.55 | 0.30 | 0.45 |
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| Compare | Value | |
|---|---|---|
| 2.4 in | NRC0.45 | |
| 16 in | NRC0.50 |
NRC: 0.45 (derived from ISO 354 lab data)
Weight / density: <15 kg / m²
Dimensions: 47 in x 1875/98 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 · <15 kg / m² · 400 mm | 0.50 | 0.48 | 0.55 | 0.83 | 0.82 | 0.81 | 0.75 | 0.60 | 0.50 | 0.54 | 0.48 | 0.44 | 0.35 | 0.32 | 0.29 | 0.25 | 0.25 | 0.28 |
| 12,5 mm · <15 kg / m² · 60 mm | 0.45 | 0.10 | 0.18 | 0.12 | 0.21 | 0.30 | 0.45 | 0.68 | 0.75 | 0.84 | 0.75 | 0.55 | 0.40 | 0.35 | 0.28 | 0.31 | 0.42 | 0.50 |
Measured values as a table (2 measurements)
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