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 Akustikstein F2K/F2KNR with mineral fiber
Polyklet Akustikstein – Type F 2 K, F 2 KNR
PTB reference data
Original description
Polyklet Akustikstein F2K/F2KNR with mineral fiber
Material properties
Manufacturer: Polyklet-Akustik
Thickness: 3.5 in (F2K), 4.3 in (F2KNR)
Wall distance: 2 in
Perforation: 47%
Backing: mineral fiber panel
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.85
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.65 | 1.00 | 0.90 | 0.85 | 0.80 |
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Value from the PTB table, not verified
NRC: 0.85 (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 | 0.85 | 0.15 | 0.37 | 0.40 | 0.54 | 0.63 | 0.83 | 1.03 | 1.00 | 0.96 | 0.93 | 0.90 | 0.84 | 0.88 | 0.88 | 0.82 | 0.82 | 0.82 | 0.78 | 0.79 |
Measured values as a table (1 measurement)
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