Reference surfaceHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Odeon (Index 505)
Value from the PTB table, not verified
Needle felt 5 mm stuck to concrete
PTB reference data
Original description
Needle felt 5 mm stuck to concrete
Material properties
Thickness: 0.2 in
Mounting: stuck to concrete
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.15
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.00 | 0.00 | 0.00 | 0.05 | 0.10 | 0.15 |
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Value from the PTB table, not verified
NRC: 0.15 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.15 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.02 | 0.00 | 0.00 | 0.05 | 0.00 | 0.00 | 0.15 | 0.00 | 0.00 | 0.30 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.40 |
Measured values as a table (1 measurement)
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