Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Value from the PTB table, not verified
Carpet: Loop pile tufted carpet, 1.4 kg/m², 9.5 mm pile height: On hair and jute pad, 3.0 kg/m²
PTB reference data
Original description
Carpet: Loop pile tufted carpet, 1.4 kg/m², 9.5 mm pile height: On hair and jute pad, 3.0 kg/m²
Material properties
Thickness: 0.4 in
Surface weight: 1.4 kg/m²
Backing: Hair and jute felt pad (3.0 kg/m²)
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 | 0.20 | 0.50 | 0.70 | 0.70 | 0.65 | 0.90 |
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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 | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.65 | 0.20 | 0.50 | 0.68 | 0.72 | 0.65 | 0.90 |
Measured values as a table (1 measurement)
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