Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: GRAVEL1, C: Floors, D: Gravel,
Value from the PTB table, not verified
Floors, gravel, 100 mm thickness
PTB reference data
Original description
Floors, gravel, 100 mm thickness
Material properties
Thickness: 3.9 in
Application: floor
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.70
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.60 | 0.65 | 0.70 | 0.75 | 0.80 |
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Value from the PTB table, not verified
NRC: 0.70 (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 | 0.70 | 0.25 | 0.60 | 0.65 | 0.70 | 0.75 | 0.80 |
Measured values as a table (1 measurement)
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