Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: BRICK_WALL7, C: Walls, D: Raised
Value from the PTB table, not verified
Walls, raised bricks with 19 holes directly on stone wall
PTB reference data
Original description
Walls, raised bricks with 19 holes directly on stone wall
Material properties
Wall distance: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.30 | 0.45 | 0.90 | 0.45 | 0.65 |
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Value from the PTB table, not verified
NRC: 0.50 (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 |
|---|---|---|---|---|---|---|---|
| 0 · bricks with 19 holes directly | 0.50 | 0.14 | 0.28 | 0.45 | 0.90 | 0.45 | 0.65 |
Measured values as a table (1 measurement)
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