GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 195
Knauf Perllit acoustic tile No. 74
Perllit acoustic tile – No. 74
PTB reference data
Original description
Knauf Perllit acoustic tile No. 74
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Wall distance: 50 mm, 500 mm
Perforation: 5.8 %
Up to fire class: at least fire-retardant
Mounting: seamless installation
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.46
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 0.55 | 0.50 | 0.45 | 0.35 | 0.20 |
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| Compare | Value | |
|---|---|---|
| 500 mm | αw0.46 | |
| 50 mm | αw0.41 |
Weight / density: ca. 16 kg / m²
Dimensions: 625 x 625 mm