WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 252
Value from the PTB table, not verified
Ernst Schmelze Eco-Phondraht wood fiber absorber, slotted, 40% open area
Eco-Phondraht
PTB reference data
Original description
Ernst Schmelze Eco-Phondraht wood fiber absorber, slotted, 40% open area
Material properties
Manufacturer: Ernst Schmelze KG
Thickness: 0.7 in
Wall distance: 2 in, 7.9 in
Perforation: approx. 40%
Backing: mineral fiber mat
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.85
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 0.75 | 0.90 | 0.90 | 0.95 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 7.9 in | NRC0.85 | |
| 2 in | NRC0.80 |
NRC: 0.85 (derived from ISO 354 lab data)
Weight / density: 2,2 kg / m²
Dimensions: bis 2000 x 47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 17 mm · 2,2 kg / m² · 50 mm | 0.80 | 0.15 | 0.22 | 0.27 | 0.41 | 0.51 | 0.59 | 0.72 | 0.87 | 0.92 | 0.98 | 0.95 | 1.00 | 0.93 | 0.92 | 1.00 | 1.03 | 1.00 | 1.04 |
| 17 mm · 2,2 kg / m² · 200 mm | 0.85 | 0.20 | 0.32 | 0.58 | 0.60 | 0.75 | 0.88 | 0.95 | 0.92 | 0.87 | 0.87 | 0.88 | 0.99 | 0.99 | 0.92 | 0.98 | 0.92 | 1.00 | 1.04 |
Measured values as a table (2 measurements)
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