FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 103
Value from the PTB table, not verified
Faist empfa-Dämmstoff M 1135 convoluted foam
empfa-Dämmstoff – M 1135
PTB reference data
Original description
Faist empfa-Dämmstoff M 1135 convoluted foam
Material properties
Manufacturer: Faist Automotive GmbH & Co. KG
Thickness: approx. 1.2 in
Surface: convoluted foam
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.45
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.15 | 0.20 | 0.50 | 0.90 | 0.95 |
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Value from the PTB table, not verified
NRC: 0.45 (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. 30 mm · ca. 0,9 kg / m² | 0.45 | 0.13 | 0.14 | 0.15 | 0.16 | 0.17 | 0.18 | 0.19 | 0.27 | 0.39 | 0.47 | 0.64 | 0.80 | 0.97 | 0.96 | 0.95 | 0.94 |
Measured values as a table (1 measurement)
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