Reference surfaceLow absorption
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Harris:Handbook of Acoustical Measurements and Noise Control, McGraw Hill 1991
Value from the PTB table, not verified
Concrete block, painted
PTB reference data
Original description
Concrete block, painted
Material properties
Surface: painted
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.10
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.05 | 0.05 | 0.05 | 0.10 | 0.10 |
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| Compare | Value |
|---|---|
| αw0.10 | |
| αw0.10 |
Measured values as a table (2 measurements)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| painted | 0.10 | 0.10 | 0.05 | 0.06 | 0.07 | 0.09 | 0.08 |
| Measurement 2 | 0.10 | 0.10 | 0.05 | 0.06 | 0.07 | 0.09 | 0.08 |
Measured values as a table (2 measurements)
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