GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 199
Value from the PTB table, not verified
Knauf Perlgips perforated panel, Helmholtz absorber
Perlgips perforated panel – straight perforation 8/18
PTB reference data
Original description
Knauf Perlgips perforated panel, Helmholtz absorber
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.4 in
Wall distance: 2.1 in, 20 in
Perforation: 15.5%
Hole size: 0.3 in
Backing: Paratex non-woven and 0.8 in mineral fiber mat
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.65
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 0.70 | 0.70 | 0.70 | 0.60 | 0.55 |
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| Compare | Value | |
|---|---|---|
| 20 in | NRC0.65 | |
| 2.1 in | NRC0.70 |
NRC: 0.65 (derived from ISO 354 lab data)
Weight / density: ca. 7 kg / m²
Dimensions: 1250 x 98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 9,5 mm · ca. 7 kg / m² · 53 mm | 0.70 | 0.00 | 0.11 | 0.18 | 0.23 | 0.41 | 0.69 | 0.80 | 0.94 | 0.99 | 0.99 | 0.86 | 0.80 | 0.67 | 0.55 | 0.53 | 0.40 | 0.38 | 0.34 |
| 9,5 mm · ca. 7 kg / m² · 500 mm | 0.65 | 0.93 | 0.85 | 0.63 | 0.65 | 0.69 | 0.69 | 0.69 | 0.64 | 0.71 | 0.70 | 0.71 | 0.69 | 0.67 | 0.59 | 0.61 | 0.60 | 0.54 | 0.53 |
Measured values as a table (2 measurements)
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