WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 250
Value from the PTB table, not verified
Ernst Schmelze Eco-Modulator 22/3, slotted plywood panel
Eco-Modulator – 22 / 3
PTB reference data
Original description
Ernst Schmelze Eco-Modulator 22/3, slotted plywood panel
Material properties
Manufacturer: Ernst Schmelze KG
Thickness: 0.8 in
Wall distance: 2 in, 7.9 in
Perforation: 20%
Hole size: 0.1 in
Backing: mineral fiber mat
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 | 0.80 | 0.70 | 0.60 |
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| Compare | Value | |
|---|---|---|
| 7.9 in | NRC0.75 | |
| 2 in | NRC0.65 |
NRC: 0.75 (derived from ISO 354 lab data)
Weight / density: 3,5 - 3,7 kg /m²
Dimensions: bis 3000 x 33 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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 mm · 3,5 - 3,7 kg /m² · 50 mm | 0.65 | 0.07 | 0.17 | 0.25 | 0.35 | 0.40 | 0.59 | 0.65 | 0.73 | 0.79 | 0.81 | 0.80 | 0.73 | 0.62 | 0.63 | 0.65 | 0.68 | 0.61 | 0.46 |
| 20 mm · 3,5 - 3,7 kg /m² · 200 mm | 0.75 | 0.22 | 0.31 | 0.40 | 0.49 | 0.71 | 0.78 | 0.80 | 0.82 | 0.76 | 0.76 | 0.81 | 0.76 | 0.68 | 0.72 | 0.69 | 0.75 | 0.59 | 0.53 |
Measured values as a table (2 measurements)
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