FeltBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 184
Value from the PTB table, not verified
Siegfried Keller Idikell M textile fiber absorber
Idikell M – Serie 6000, with film facing
PTB reference data
Original description
Siegfried Keller Idikell M textile fiber absorber
Material properties
Manufacturer: Siegfried Keller AG
Thickness: 0.4 in, 0.8 in
Wall distance: 0 in
Perforation: 4%
Backing: perforated film facing
Surface: with film facing
Up to fire class: self-extinguishing
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.55
Frequency values
αp per octave band
| f (Hz) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.25 | 0.65 | 0.85 | 0.55 | 0.35 |
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| Compare | Value | |
|---|---|---|
| 0.8 in | NRC0.55 | |
| 0.4 in | NRC0.50 |
NRC: 0.55 (derived from ISO 354 lab data)
Weight / density: 40 - 60 kg / m³
Distance: 0, with gelochter Folienabdeckung 4 % Lochanteil
Measured values as a table (2 measurements)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 mm · 40 - 60 kg / m³ · 0, with gelochter Folienabdeckung 4 % Lochanteil | 0.50 | 0.05 | 0.14 | 0.17 | 0.20 | 0.40 | 0.60 | 0.73 | 0.80 | 0.83 | 0.80 | 0.75 | 0.67 | 0.54 | 0.40 |
| 20 mm · 40 - 60 kg / m³ · 0, with gelochter Folienabdeckung 4 % Lochanteil | 0.55 | 0.16 | 0.19 | 0.35 | 0.50 | 0.60 | 0.81 | 0.86 | 0.90 | 0.79 | 0.65 | 0.54 | 0.51 | 0.40 | 0.34 |
Measured values as a table (2 measurements)
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