GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 194
Value from the PTB table, not verified
Knauf Perllit sound absorber panel No. 73
Perllit sound absorber panel – No. 73
PTB reference data
Original description
Knauf Perllit sound absorber panel No. 73
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 30 mm
Wall distance: 50 mm, 500 mm
Perforation: 3.3%
Hole size: 4.5 mm, 6 mm, 8 mm
Up to fire class: fire-retardant
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.25
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.55 | 0.40 | 0.35 | 0.30 | 0.20 | 0.10 |
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| Compare | Value | |
|---|---|---|
| 500 mm | αw0.25 | |
| 50 mm | αw0.20 |
Weight / density: ca. 14 kg / m²
Dimensions: 625 x 625 mm
Measured values as a table (2 measurements)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 mm · ca. 14 kg / m² · 50 mm | 0.20 | 0.20 | 0.23 | 0.27 | 0.56 | 0.76 | 0.74 | 0.72 | 0.57 | 0.44 | 0.37 | 0.28 | 0.23 | 0.18 | 0.15 | 0.10 | 0.07 | 0.04 | 0.01 |
| 30 mm · ca. 14 kg / m² · 500 mm | 0.25 | 0.53 | 0.68 | 0.50 | 0.44 | 0.38 | 0.37 | 0.35 | 0.37 | 0.37 | 0.37 | 0.28 | 0.23 | 0.20 | 0.20 | 0.14 | 0.13 | 0.11 | 0.13 |
Measured values as a table (2 measurements)
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