GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
Sto-Knauf Acoustic Element Ceiling D 125
Sto-Knauf Acoustic Element Ceiling D 125
PTB reference data
Original description
Sto-Knauf Acoustic Element Ceiling D 125
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 1.2 in + 2.5 - 0.1 in plaster
Wall distance: 18 in
Application: ceiling
Mounting: on metal sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 4 variants
NRC
0.75
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.45 | 0.70 | 0.80 | 0.75 | 0.65 | 0.55 |
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| Compare | Value |
|---|---|
| NRC0.75 | |
| NRC0.65 |
NRC: 0.75 (derived from ISO 354 lab data)
Weight / density: ca. 21 kg / m² incl. Putz
Dimensions: 900 x 2100 x 1.2 in
Measured values as a table (4 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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30,5 mm + 2,5 - 3 mm Putz · ca. 21 kg / m² incl. Putz · 460 mm · Sto Silent fein | 0.65 | – | 0.62 | – | – | 0.60 | – | – | 0.72 | – | – | 0.74 | – | – | 0.58 | – | – | 0.53 | – |
| 30,5 mm + 2,5 - 3 mm Putz · ca. 21 kg / m² incl. Putz · Sto Silent fein | 0.75 | 0.30 | 0.42 | 0.69 | 0.59 | 0.70 | 0.82 | 0.81 | 0.82 | 0.78 | 0.74 | 0.73 | 0.71 | 0.70 | 0.65 | 0.58 | 0.54 | 0.61 | 0.54 |
| 30,5 mm + 2,5 - 3 mm Putz · ca. 21 kg / m² incl. Putz · 460 mm · Sto Silent fein | 0.65 | – | 0.62 | – | – | 0.60 | – | – | 0.72 | – | – | 0.74 | – | – | 0.58 | – | – | 0.53 | – |
| 30,5 mm + 2,5 - 3 mm Putz · ca. 21 kg / m² incl. Putz · Sto Silent fein | 0.75 | 0.30 | 0.42 | 0.69 | 0.59 | 0.70 | 0.82 | 0.81 | 0.82 | 0.78 | 0.74 | 0.73 | 0.71 | 0.70 | 0.65 | 0.58 | 0.54 | 0.61 | 0.54 |
Measured values as a table (4 measurements)
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