WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerunterlagen
Value from the PTB table, not verified
ESO-Akustik Modulator 22/3 ceiling facing, plywood strips
ESO MODULATOR 22/3
PTB reference data
Original description
ESO-Akustik Modulator 22/3 ceiling facing, plywood strips
Material properties
Manufacturer: ESO-Akustik Brigitte Schmelzle
Thickness: 0.2 in
Wall distance: 7.9 in (filled), 2 in (filled)
Dimensions: 0.9 in wide plywood strips, 0.1 in spacing
Backing: non-woven fiber 0.02 kg/m², 1.6 in mineral wool 0.6 kg/m²
Application: ceiling facing
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.75
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.65 | 0.80 | 0.75 | 0.70 | 0.60 |
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| Compare | Value | |
|---|---|---|
| 7.9 in (gefüllt) | NRC0.75 | |
| 2 in (gefüllt) | NRC0.65 |
NRC: 0.75 (derived from ISO 354 lab data)
Application: Holzrahmenkonstruktion
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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 mm · 200 mm (gefüllt) · Holzrahmenkonstruktion · geschlitzte Holzoberfläche | 0.75 | 0.20 | 0.31 | 0.41 | 0.50 | 0.71 | 0.78 | 0.80 | 0.82 | 0.75 | 0.73 | 0.81 | 0.75 | 0.69 | 0.72 | 0.71 | 0.75 | 0.59 | 0.52 |
| 4 mm · 50 mm (gefüllt) · Holzrahmenkonstruktion · geschlitzte Holzoberfläche | 0.65 | 0.07 | 0.17 | 0.28 | 0.35 | 0.40 | 0.58 | 0.65 | 0.73 | 0.80 | 0.80 | 0.80 | 0.75 | 0.62 | 0.63 | 0.64 | 0.68 | 0.61 | 0.48 |
Measured values as a table (2 measurements)
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