illsilent flexible polyurethane foam, pyramid profile
illsilent – S 20 Z, S 20 SEF, S 28 SV/SEF
NRC 0.75–0.85
PTB reference data
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FoamHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 172
Value from the PTB table, not verified
Original description
illsilent flexible polyurethane foam, pyramid profile
Material properties
Manufacturer: illbruck GmbH
Thickness: 3.9 in, 2.8 in
Wall distance: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.85
Frequency values
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| Compare | Value | |
|---|---|---|
| 3.9 in | NRC0.85 | |
| 2.8 in | NRC0.75 |
NRC: 0.85 (derived from ISO 354 lab data)
Weight / density: ca. 20 - 28 kg / m³
Dimensions: 39 x 39 in
Distance: 0
Measured values as a table (2 measurements)
| Build-up | NRC | 100 Hz | 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 | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.9 in · ca. 20 - 28 kg / m³ · 0 · on one side profiliert (Pyramiden) | 0.85 | 0.04 | 0.06 | 0.21 | 0.39 | 0.53 | 0.63 | 0.78 | 0.90 | 0.93 | 0.99 | 1.02 | 1.00 | 0.99 | 0.97 | 1.00 | 1.03 | 1.09 | 1.15 | 1.18 |
| 2.8 in · ca. 20 - 28 kg / m³ · 0 · on one side profiliert (Pyramiden) | 0.75 | 0.06 | 0.10 | 0.18 | 0.21 | 0.28 | 0.40 | 0.47 | 0.59 | 0.77 | 0.90 | 1.08 | 1.08 | 1.07 | 1.07 | 1.05 | 1.02 | 1.01 | 0.99 | 0.98 |
Measured values as a table (2 measurements)
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