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 slotline B4 slotted gypsum board acoustic panel
D 127 slotline B4
PTB reference data
Original description
Knauf D 127 slotline B4 slotted gypsum board acoustic panel
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in
Wall distance: 2.4 in, 16 in
Perforation: 13.7%
Backing: 0.8 in mineral fiber
Surface: slotted
Mounting: on sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.65
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.65 | 0.85 | 0.70 | 0.65 | 0.45 | 0.45 |
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| Compare | Value | |
|---|---|---|
| 16 in | NRC0.65 | |
| 2.4 in | NRC0.70 |
NRC: 0.65 (derived from ISO 354 lab data)
Weight / density: <15 kg / m²
Dimensions: 47 in x 94 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 | 0.65 | 0.52 | 0.56 | 0.87 | 0.93 | 0.88 | 0.77 | 0.65 | 0.66 | 0.74 | 0.71 | 0.68 | 0.60 | 0.49 | 0.47 | 0.45 | 0.44 | 0.46 |
| 12,5 mm + 20 mm Mineralfaser · <15 kg / m² · 60 mm | 0.70 | 0.17 | 0.27 | 0.37 | 0.59 | 0.66 | 0.84 | 1.02 | 0.98 | 0.97 | 0.80 | 0.70 | 0.60 | 0.44 | 0.40 | 0.35 | 0.34 | 0.32 |
Measured values as a table (2 measurements)
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