WoodBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 156
Value from the PTB table, not verified
Wilhelmi acoustic panel Variantex 09 panel absorber
Wilhelmi acoustic panel – Variantex 09 (1981)
PTB reference data
Original description
Wilhelmi acoustic panel Variantex 09 panel absorber
Material properties
Manufacturer: Wilhelmi Werke AG
Thickness: approx. 18 mm
Wall distance: 50 mm, 300 mm
Surface: closed, resin-bonded foil, matte dabbed lacquer coating
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.15
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.45 | 0.20 | 0.15 | 0.10 | 0.10 | 0.10 |
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| Compare | Value | |
|---|---|---|
| 300 mm | αw0.15 | |
| 50 mm | αw0.10 |
Weight / density: 6 - 7,5 kg / m²
Measured values as a table (2 measurements)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 18 mm · 6 - 7,5 kg / m² · 50 mm | 0.10 | 0.26 | 0.32 | 0.39 | 0.47 | 0.31 | 0.22 | 0.22 | 0.16 | 0.13 | 0.11 | 0.10 | 0.09 | 0.08 | 0.07 | 0.07 | 0.07 | 0.10 |
| ca. 18 mm · 6 - 7,5 kg / m² · 300 mm | 0.15 | 0.58 | 0.41 | 0.30 | 0.20 | 0.16 | 0.17 | 0.16 | 0.14 | 0.13 | 0.12 | 0.12 | 0.12 | 0.11 | 0.11 | 0.11 | 0.10 | 0.09 |
Measured values as a table (2 measurements)
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