Mineral woolHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 160
Value from the PTB table, not verified
Wilhelmi Mikropor acoustic foil Type V
Wilhelmi-Akustikplatte – Mikropor, Akustik-Folie Type V (1981)
PTB reference data
Original description
Wilhelmi Mikropor acoustic foil Type V
Material properties
Manufacturer: Wilhelmi Werke AG
Thickness: 0 in (foil), 1.6 in (web height)
Wall distance: 0.4 in, 7.9 in
Surface: trapezoidal profile
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.75
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.65 | 0.85 | 0.65 | 0.75 | 0.75 |
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| Compare | Value | |
|---|---|---|
| 7.9 in | NRC0.75 | |
| 0.4 in | NRC0.45 |
NRC: 0.75 (derived from ISO 354 lab data)
Dimensions: 1250 x 98 in
Measured values as a table (2 measurements)
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Foliendicke 1 mm, Steghöhe des Trapezprofils 40 mm · 10 mm | 0.45 | 0.06 | 0.04 | 0.08 | 0.07 | 0.14 | 0.17 | 0.26 | 0.33 | 0.43 | 0.54 | 0.60 | 0.78 | 0.79 | 0.79 | 0.78 | 0.75 | 0.67 | 0.76 | 0.75 |
| Foliendicke 1 mm, Steghöhe des Trapezprofils 40 mm · 200 mm | 0.75 | 0.19 | 0.22 | 0.23 | 0.57 | 0.61 | 0.79 | 0.98 | 0.99 | 0.56 | 0.54 | 0.63 | 0.78 | 0.73 | 0.76 | 0.78 | 0.80 | 0.75 | 0.74 | 0.67 |
Measured values as a table (2 measurements)
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