FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: FOAMPLASTIC2, C: Misc, D: Porous
Value from the PTB table, not verified
Misc, porous foam plastic 20 mm (CATT: FOAMPLASTIC2)
PTB reference data
Original description
Misc, porous foam plastic 20 mm (CATT: FOAMPLASTIC2)
Material properties
Thickness: 0.8 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.05 | 0.35 | 0.70 | 0.95 | 0.90 |
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Value from the PTB table, not verified
NRC: 0.50 (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 | 0.50 | 0.03 | 0.07 | 0.35 | 0.72 | 0.95 | 0.90 |
Measured values as a table (1 measurement)
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