WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 157
Value from the PTB table, not verified
Wilhelmi Variantex 05 wood fiber absorber
Wilhelmi acoustic panel – Variantex 05 (1981)
PTB reference data
Original description
Wilhelmi Variantex 05 wood fiber absorber
Material properties
Manufacturer: Wilhelmi Werke AG
Thickness: approx. 18 mm
Wall distance: 50 mm, 300 mm
Surface: fine chip layer with lacquer coating
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.60
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.65 | 0.80 | 0.55 | 0.60 | 0.70 |
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| Compare | Value | |
|---|---|---|
| 50 mm | αw0.60 | |
| 300 mm | αw0.60 |
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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 18 mm · 6 - 7,5 kg / m² · 50 mm · Feinspanschicht with Lackauflage | 0.60 | 0.24 | 0.23 | 0.40 | 0.60 | 0.60 | 0.80 | 0.82 | 0.83 | 0.70 | 0.60 | 0.52 | 0.60 | 0.62 | 0.62 | 0.62 | 0.63 | 0.64 | 0.78 |
| ca. 18 mm · 6 - 7,5 kg / m² · 300 mm · Feinspanschicht with Lackauflage | 0.60 | 0.80 | 0.68 | 0.75 | 0.75 | 0.84 | 0.72 | 0.67 | 0.62 | 0.53 | 0.58 | 0.53 | 0.60 | 0.62 | 0.63 | 0.61 | 0.59 | 0.55 | 0.62 |
Measured values as a table (2 measurements)
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