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 panel, perforated gypsum board, 12/20/66 R
Akustikdesignplatte – D 127 Lochung 12/20/66R
PTB reference data
Original description
Knauf D 127 acoustic panel, perforated gypsum board, 12/20/66 R
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in
Wall distance: 16 in, 2.4 in
Perforation: 19.6%
Hole size: 0.5 in
Backing: 0.8 in mineral fiber
Surface: standard non-woven
Mounting: on sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.80
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.70 | 0.90 | 0.80 | 0.85 | 0.60 | 0.65 |
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| Compare | Value | |
|---|---|---|
| 16 in | NRC0.80 | |
| 2.4 in | NRC0.75 |
NRC: 0.80 (derived from ISO 354 lab data)
Weight / density: <15 kg / m²
Dimensions: 47 in x 78 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 | 0.80 | 0.51 | 0.66 | 0.96 | 0.93 | 0.94 | 0.85 | 0.77 | 0.78 | 0.86 | 0.86 | 0.85 | 0.80 | 0.69 | 0.59 | 0.57 | 0.60 | 0.74 |
| 12,5 mm + 20 mm Mineralfaser · <15 kg / m² · 60 mm | 0.75 | 0.18 | 0.28 | 0.24 | 0.40 | 0.55 | 0.65 | 0.98 | 1.07 | 1.12 | 1.03 | 0.85 | 0.65 | 0.60 | 0.43 | 0.43 | 0.50 | 0.59 |
Measured values as a table (2 measurements)
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