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 drywall 8/18 Q, 19.8% open area
D 127 perforation 8/18Q
PTB reference data
Original description
Knauf D 127 acoustic panel, perforated drywall 8/18 Q, 19.8% open area
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in
Wall distance: 16 in, 2.4 in
Perforation: 19.8%
Hole size: 0.3 in
Backing: standard fiber non-woven
Mounting: on sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.60
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.85 | 0.60 | 0.55 | 0.50 | 0.50 |
Create a permanent free account — Access frequency bands, variants and export.
Free. No password required.
| Compare | Value | |
|---|---|---|
| 16 in | NRC0.60 | |
| 2.4 in | NRC0.50 |
NRC: 0.60 (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 · <15 kg / m² · 400 mm | 0.60 | 0.40 | 0.57 | 0.88 | 0.86 | 0.86 | 0.80 | 0.60 | 0.52 | 0.62 | 0.60 | 0.59 | 0.52 | 0.52 | 0.47 | 0.46 | 0.45 | 0.52 |
| 12,5 mm · <15 kg / m² · 60 mm | 0.50 | 0.08 | 0.17 | 0.08 | 0.10 | 0.18 | 0.28 | 0.46 | 0.60 | 0.80 | 0.86 | 0.81 | 0.70 | 0.60 | 0.50 | 0.47 | 0.60 | 0.69 |
Measured values as a table (2 measurements)
Access frequency bands, variants and export. Create a permanent free account
Last updated: