WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 159
Value from the PTB table, not verified
Wilhelmi acoustic panel Variantex-Rupfen
Wilhelmi acoustic panel – Variantex-Rupfen (1981)
PTB reference data
Original description
Wilhelmi acoustic panel Variantex-Rupfen
Material properties
Manufacturer: Wilhelmi Werke AG
Thickness: approx. 18 mm
Wall distance: 50 mm, 300 mm
Surface: coated with acoustic non-woven and natural fiber burlap
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.50
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.25 | 0.45 | 0.85 | 0.75 | 0.65 |
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| Compare | Value | |
|---|---|---|
| 50 mm | αw0.50 | |
| 300 mm | αw0.45 |
Weight / density: 6 - 7 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 kg / m² · 50 mm · acoustic fleece and Naturfaser-Rupfen | 0.50 | 0.24 | 0.36 | 0.35 | 0.33 | 0.18 | 0.19 | 0.37 | 0.39 | 0.60 | 0.80 | 0.90 | 0.83 | 0.83 | 0.83 | 0.65 | 0.63 | 0.64 |
| ca. 18 mm · 6 - 7 kg / m² · 300 mm · acoustic fleece and Naturfaser-Rupfen | 0.45 | 0.32 | 0.30 | 0.25 | 0.16 | 0.17 | 0.19 | 0.36 | 0.42 | 0.70 | 0.79 | 0.86 | 0.86 | 0.80 | 0.77 | 0.65 | 0.66 | 0.67 |
Measured values as a table (2 measurements)
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