FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Herstellerunterlagen 1991
illsonic waffel soft foam sound absorber with waffle structure
illsonic waffel
PTB reference data
Original description
illsonic waffel soft foam sound absorber with waffle structure
Material properties
Manufacturer: illbruck GmbH
Thickness: 50 mm, 70 mm
Surface: waffle structure
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.85
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.95 | 1.15 | 1.05 | 1.20 |
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| Compare | Value | |
|---|---|---|
| 70 mm | αw0.85 | |
| 50 mm | αw0.72 |
