WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data im Internet, mit Verweis auf ita-Prüfzeugnis, 14.11.2000
Value from the PTB table, not verified
Wilhelmi Variante X FWA seamless ceiling and wall system
Variante X FWA Normalstruktur
PTB reference data
Original description
Wilhelmi Variante X FWA seamless ceiling and wall system
Material properties
Manufacturer: Wilhelmi Werke AG
Wall distance: 2 in
Surface: Wilhelmi acoustic plaster, grain size K 3.0
Application: ceiling, wall
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 | 0.25 | 0.70 | 0.80 | 0.65 | 0.50 |
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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.55 | 0.13 | 0.08 | 0.10 | 0.23 | 0.12 | 0.42 | 0.60 | 0.73 | 0.74 | 0.82 | 0.80 | 0.75 | 0.68 | 0.64 | 0.65 | 0.56 | 0.52 | 0.47 |
Measured values as a table (1 measurement)
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