Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-7a
Value from the PTB table, not verified
Perforated brick, 40% perforation ratio
PTB reference data
Original description
Perforated brick, 40% perforation ratio
Material properties
Thickness: 2.4 in
Wall distance: 7.9 in
Dimensions: 240 x 240 x 2.4 in
Perforation: 40%
Hole size: 10.5 x 0.4 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.20
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.15 | 0.15 | 0.15 | 0.25 | 0.25 |
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Value from the PTB table, not verified
NRC: 0.20 (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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 60 mm · 200 mm | 0.20 | 0.03 | 0.08 | 0.13 | 0.13 | 0.15 | 0.15 | 0.14 | 0.14 | 0.14 | 0.12 | 0.16 | 0.18 | 0.22 | 0.28 | 0.25 | 0.25 | 0.25 | 0.30 | 0.20 |
Measured values as a table (1 measurement)
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