FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 188
Value from the PTB table, not verified
Siegfried Keller Idikell M 3817/28 PU foam absorber with PVC foil
Idikell – M 3817/28
PTB reference data
Original description
Siegfried Keller Idikell M 3817/28 PU foam absorber with PVC foil
Material properties
Manufacturer: Siegfried Keller AG
Thickness: 1.1 in
Hole size: 0.1 in
Surface: perforated 0.2 in thick PVC foil
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.40
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.10 | 0.20 | 0.45 | 0.85 | 0.80 |
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Value from the PTB table, not verified
NRC: 0.40 (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 | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 28 mm · 3,3 kg / m² | 0.40 | 0.08 | 0.08 | 0.09 | 0.10 | 0.12 | 0.15 | 0.18 | 0.26 | 0.37 | 0.45 | 0.60 | 0.78 | 0.90 | 0.83 | 0.77 | 0.70 | 0.88 |
Measured values as a table (1 measurement)
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