WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 155
Value from the PTB table, not verified
Wilhelmi Mikropor UB acoustic panel made of vermiculite
Wilhelmi-Akustikplatte – Mikropor UB (1981)
PTB reference data
Original description
Wilhelmi Mikropor UB acoustic panel made of vermiculite
Material properties
Manufacturer: Wilhelmi Werke AG
Thickness: approx. 0.6 in
Wall distance: 1.9 in
Surface: acoustic non-woven, fine-pored special coating
Up to fire class: non-combustible
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.55
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.45 | 0.70 | 0.50 | 0.45 | 0.55 |
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Value from the PTB table, not verified
NRC: 0.55 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 15 mm · ca. 4 kg / m² · 48 mm · acoustic fleece, feinporiger Speziallack | 0.55 | 0.03 | 0.09 | 0.13 | 0.23 | 0.50 | 0.60 | 0.70 | 0.74 | 0.70 | 0.59 | 0.54 | 0.43 | 0.46 | 0.48 | 0.48 | 0.53 | 0.55 | 0.53 | 0.55 |
Measured values as a table (1 measurement)
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