GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 207
Value from the PTB table, not verified
Knauf Perllit-Dekorplatte No. 30, gypsum fiber absorber
Perllit-Dekorplatte – No. 30
PTB reference data
Original description
Knauf Perllit-Dekorplatte No. 30, gypsum fiber absorber
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Wall distance: 2 in, 20 in
Perforation: 32.5%
Backing: Paratex fiber non-woven and 1.2 in mineral wool
Up to fire class: at least fire-retardant
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.70
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.95 | 0.75 | 0.70 | 0.75 | 0.60 | 0.40 |
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| Compare | Value | |
|---|---|---|
| 20 in | NRC0.70 | |
| 2 in | NRC0.65 |
NRC: 0.70 (derived from ISO 354 lab data)
Weight / density: ca. 17 kg / m²
Dimensions: 625 x 25 in
Measured values as a table (2 measurements)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 17 kg / m² · 50 mm | 0.65 | 0.15 | 0.25 | 0.35 | 0.44 | 0.62 | 0.81 | 1.03 | 0.93 | 0.82 | 0.74 | 0.63 | 0.55 | 0.47 | 0.41 | 0.38 | 0.35 |
| ca. 17 kg / m² · 500 mm | 0.70 | 1.01 | 0.90 | 0.80 | 0.71 | 0.70 | 0.69 | 0.68 | 0.71 | 0.74 | 0.76 | 0.70 | 0.63 | 0.58 | 0.52 | 0.43 | 0.38 |
Measured values as a table (2 measurements)
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