FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 100
Value from the PTB table, not verified
Faist Automotive empfa-Dämmstoff M 638 polyether foam absorber
empfa-Dämmstoff – M 638
PTB reference data
Original description
Faist Automotive empfa-Dämmstoff M 638 polyether foam absorber
Material properties
Manufacturer: Faist Automotive GmbH & Co. KG
Thickness: approx. 0.5 in
Wall distance: 0 in
Backing: 0.1 in bitumen-free damping compound
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.15
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 | 0.10 | 0.20 | 0.35 | 0.60 |
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Value from the PTB table, not verified
NRC: 0.15 (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. 13 mm · ca. 3,97 kg / m² · 0 | 0.15 | 0.03 | 0.03 | 0.03 | 0.04 | 0.05 | 0.06 | 0.07 | 0.10 | 0.15 | 0.18 | 0.22 | 0.27 | 0.33 | 0.42 | 0.57 | 0.65 |
Measured values as a table (1 measurement)
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