GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 203
Value from the PTB table, not verified
Knauf Perlgips perforated gypsum board, staggered perforation 12/20/46
Perlgips perforated gypsum board – staggered perforation 12/20/46
PTB reference data
Original description
Knauf Perlgips perforated gypsum board, staggered perforation 12/20/46
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.4 in
Wall distance: 2.1 in
Perforation: 12.6 %
Hole size: 0.5 in, 0.8 in
Backing: Paratex non-woven and 0.8 in mineral fiber mat
Application: Helmholtz absorber
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.70
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.45 | 0.85 | 0.80 | 0.60 | 0.50 |
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Value from the PTB table, not verified
NRC: 0.70 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 | 0.12 | 0.21 | 0.32 | 0.42 | 0.60 | 0.77 | 0.95 | 0.90 | 0.86 | 0.83 | 0.74 | 0.63 | 0.56 | 0.54 | 0.49 | 0.46 |
Measured values as a table (1 measurement)
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