Reference surfaceLow absorption
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: CONCRETE_BLK, C: Walls, D: Concrete
Value from the PTB table, not verified
Walls, concrete block, with or without plaster, painted
PTB reference data
Original description
Walls, concrete block, with or without plaster, painted
Material properties
Surface: painted
Application: wall
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.05
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.10 | 0.05 | 0.05 | 0.05 | 0.05 |
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Value from the PTB table, not verified
NRC: 0.05 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.05 | 0.11 | 0.08 | 0.07 | 0.06 | 0.05 | 0.05 |
Measured values as a table (1 measurement)
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