Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: RAMSETE
Value from the PTB table, not verified
Davidson thickness=20 mm (Gal. Ferr.)
PTB reference data
Original description
Davidson thickness=20 mm (Gal. Ferr.)
Material properties
Thickness: 0.8 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.65
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.15 | 0.60 | 0.95 | 0.90 | 0.85 |
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Value from the PTB table, not verified
NRC: 0.65 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.65 | 0.04 | 0.10 | 0.16 | 0.60 | 0.93 | 0.90 | 0.85 | 0.80 |
Measured values as a table (1 measurement)
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