FabricHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: COTTON3, C: Curtains, D: Cotton
Value from the PTB table, not verified
Curtains, cotton cloth (0.33 kg/m²) folded to 7/8 area (CATT: COTTON3)
PTB reference data
Original description
Curtains, cotton cloth (0.33 kg/m²) folded to 7/8 area (CATT: COTTON3)
Material properties
Surface weight: 0.33 kg/m²
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.25
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.10 | 0.15 | 0.25 | 0.35 | 0.40 |
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Value from the PTB table, not verified
NRC: 0.25 (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 | 0.25 | 0.03 | 0.12 | 0.15 | 0.27 | 0.37 | 0.42 |
Measured values as a table (1 measurement)
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