Reference surfaceHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: M. Heckl, H.A. Müller: Taschenbuch der Technischen Akustik, Springer 1994
Value from the PTB table, not verified
Loop pile carpet, surface-treated
PTB reference data
Original description
Loop pile carpet, surface-treated
Material properties
Thickness: 0.2 in
Mounting: mounted directly on floor
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) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.00 | 0.05 | 0.15 | 0.35 | 0.30 |
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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 | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|
| 4,5 mm | 0.15 | 0.02 | 0.04 | 0.15 | 0.36 | 0.32 |
Measured values as a table (1 measurement)
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