Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Wärme Kälte Schall Heft 1 (March) 1970
Value from the PTB table, not verified
Polyklet acoustic perforated brick with Sillan panels
PTB reference data
Original description
Polyklet acoustic perforated brick with Sillan panels
Material properties
Wall distance: 2 in
Perforation: approx. 43%
Backing: 1.2 in Sillan acoustic panels
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.65
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.40 | 0.60 | 0.80 | 0.80 | 0.70 |
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Value from the PTB table, not verified
NRC: 0.65 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 mm | 0.65 | 0.20 | 0.26 | 0.34 | 0.40 | 0.46 | 0.54 | 0.60 | 0.66 | 0.74 | 0.80 | 0.80 | 0.80 | 0.80 | 0.77 | 0.73 | 0.70 |
Measured values as a table (1 measurement)
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