Reference surfaceLow absorption
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: RAMSETE
Value from the PTB table, not verified
2 heads wall - full brick UNI 12x25x5.5 cm, 15% joints + whitewash
PTB reference data
Original description
2 heads wall - full brick UNI 12x25x5.5 cm, 15% joints + whitewash
Material properties
Perforation: 15%
Surface: whitewashed
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.05
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.00 | 0.00 | 0.05 | 0.05 | 0.05 | 0.05 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.05 | 0.02 | 0.02 | 0.02 | 0.03 | 0.04 | 0.04 | 0.03 | 0.02 |
Measured values as a table (1 measurement)
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