GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 192
Value from the PTB table, not verified
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: 1.2 in
Wall distance: 2 in, 20 in
Perforation: 10.85%
Hole size: 0.2 in
Up to fire class: at least fire-retardant
Application: Helmholtz absorber
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 | 0.15 | 0.40 | 0.90 | 0.75 | 0.65 | 0.35 |
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| Compare | Value | |
|---|---|---|
| 2 in | NRC0.70 | |
| 20 in | NRC0.70 |
NRC: 0.70 (derived from ISO 354 lab data)
Weight / density: ca. 15 kg / m²
Dimensions: 625 x 25 in
Measured values as a table (2 measurements)
| Build-up | NRC | 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. 15 kg / m² · 50 mm | 0.70 | 0.13 | 0.12 | 0.13 | 0.22 | 0.35 | 0.58 | 0.80 | 0.95 | 0.96 | 0.87 | 0.75 | 0.63 | 0.65 | 0.67 | 0.56 | 0.45 | 0.33 | 0.24 |
| 30 mm · ca. 15 kg / m² · 500 mm | 0.70 | 0.83 | 0.85 | 0.76 | 0.69 | 0.71 | 0.58 | 0.58 | 0.65 | 0.66 | 0.68 | 0.71 | 0.70 | 0.69 | 0.64 | 0.56 | 0.45 | 0.36 | 0.31 |
Measured values as a table (2 measurements)
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