GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
Knauf Twin D 123 acoustic design panel with mineral fiber insulation
Knauf Twin – D 123 perforation 15/30
PTB reference data
Original description
Knauf Twin D 123 acoustic design panel with mineral fiber insulation
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in, 0.5 in
Wall distance: 14 in
Perforation: straight-drilled round perforation
Backing: 0.8 in mineral fiber insulation incl. standard non-woven
Up to fire class: F30A
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.75
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.50 | 0.90 | 1.00 | 0.75 | 0.65 |
Create a permanent free account — Access frequency bands, variants and export.
Free. No password required.
Value from the PTB table, not verified
NRC: 0.75 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12,5 + 12,5 mm · 358 mm | 0.75 | 0.28 | 0.29 | 0.31 | 0.39 | 0.49 | 0.61 | 0.75 | 0.87 | 1.01 | 1.08 | 1.00 | 0.95 | 0.84 | 0.71 | 0.63 | 0.58 | 0.62 | 0.73 |
Measured values as a table (1 measurement)
Access frequency bands, variants and export. Create a permanent free account
Last updated: