GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 202
Value from the PTB table, not verified
Knauf Perlgips perforated board, staggered perforation 8/12/36
Perlgips perforated board – staggered perforation 8/12/36
PTB reference data
Original description
Knauf Perlgips perforated board, staggered perforation 8/12/36
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.4 in
Wall distance: 2.1 in, 20 in
Perforation: 12.6 %
Hole size: 0.3 in, 0.5 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 | 0.85 | 0.70 | 0.65 | 0.70 | 0.60 | 0.45 |
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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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 9,5 mm · ca. 7 kg / m² · 53 mm | 0.70 | 0.14 | 0.24 | 0.40 | 0.53 | 0.70 | 0.88 | 1.03 | 0.91 | 0.80 | 0.73 | 0.62 | 0.53 | 0.44 | 0.44 | 0.43 | 0.43 |
| 9,5 mm · ca. 7 kg / m² · 500 mm | 0.65 | 0.91 | 0.81 | 0.73 | 0.66 | 0.66 | 0.67 | 0.67 | 0.68 | 0.69 | 0.69 | 0.66 | 0.63 | 0.60 | 0.55 | 0.50 | 0.43 |
Measured values as a table (2 measurements)
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