GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 192
Knauf Perllit Sound Absorption Panel No. 71
Perllit Sound Absorption Panel – No. 71
PTB reference data
Original description
Knauf Perllit Sound Absorption Panel No. 71
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 30 mm
Wall distance: 50 mm, 500 mm
Perforation: 10.85%
Hole size: 6 mm
Up to fire class: at least fire-retardant
Application: Helmholtz absorber
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.65
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 0.65 | 0.65 | 0.70 | 0.65 | 0.35 |
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| Compare | Value | |
|---|---|---|
| 500 mm | αw0.65 | |
| 50 mm | αw0.53 |
Weight / density: ca. 15 kg / m²
Dimensions: 625 x 625 mm