FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 101
Value from the PTB table, not verified
Faist Automotive empfa-Dämmstoff M 927 polyether foam absorber
empfa-Dämmstoff – M 927
PTB reference data
Original description
Faist Automotive empfa-Dämmstoff M 927 polyether foam absorber
Material properties
Manufacturer: Faist Automotive GmbH & Co. KG
Thickness: approx. 0.5 in (0.2 in polyether foam, 0.1 in thermoplastic layer, 0.2 in polyether foam)
Wall distance: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.30
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 | 0.15 | 0.45 | 0.50 | 0.50 |
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Value from the PTB table, not verified
NRC: 0.30 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 160 Hz | 200 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 12 mm · ca. 3,75 kg / m² · 0 | 0.30 | 0.04 | 0.05 | 0.06 | 0.06 | 0.08 | 0.11 | 0.15 | 0.26 | 0.40 | 0.50 | 0.50 | 0.50 | 0.50 | 0.49 | 0.49 | 0.48 |
Measured values as a table (1 measurement)
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