Plastic & filmBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968 b 1.1-1
Value from the PTB table, not verified
PVC plastic film, stretched smooth, 0.2 mm, 20 mm air cavity, spacing 20 mm
PTB reference data
Original description
PVC plastic film, stretched smooth, 0.2 mm, 20 mm air cavity, spacing 20 mm
Material properties
Thickness: 0 in
Wall distance: 0.8 in
Surface weight: 0.2 kg/m²
Surface: stretched smooth
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) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.00 | 0.35 | 0.20 | 0.10 | 0.05 |
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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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0,2 mm · 0,2 kg/m^2 · 20 mm · glatt gespannt | 0.25 | 0.00 | 0.00 | 0.03 | 0.07 | 0.64 | 0.30 | 0.20 | 0.19 | 0.17 | 0.15 | 0.12 | 0.10 | 0.08 | 0.04 | 0.05 | 0.05 |
Measured values as a table (1 measurement)
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