Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 225
Value from the PTB table, not verified
Polyklet F2K/F2KNR acoustic brick with sound-absorbing foil
Polyklet acoustic brick – Type F 2 K, F 2 KNR
PTB reference data
Original description
Polyklet F2K/F2KNR acoustic brick with sound-absorbing foil
Material properties
Manufacturer: Polyklet-Akustik
Thickness: F2K 3.5 in, F2KNR 4.3 in
Wall distance: 2 in
Perforation: 47%
Backing: porous sound-absorbing foil
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.75
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.55 | 0.85 | 0.85 | 0.80 | 0.60 |
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Value from the PTB table, not verified
NRC: 0.75 (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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F2K 90 mm F2KNR 110 mm · 50 mm | 0.75 | 0.24 | 0.33 | 0.35 | 0.40 | 0.45 | 0.73 | 0.87 | 0.88 | 0.86 | 0.84 | 0.83 | 0.88 | 0.84 | 0.81 | 0.74 | 0.71 | 0.61 | 0.54 | 0.59 |
Measured values as a table (1 measurement)
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