GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 204
Value from the PTB table, not verified
Knauf Perlgips cassette, perforated 6/18 with mineral fiber
Perlgips cassette, perforated – 4520 01-06 perforation 6/18
PTB reference data
Original description
Knauf Perlgips cassette, perforated 6/18 with mineral fiber
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.4 in
Wall distance: 2.1 in
Perforation: 7.5%
Hole size: 0.2 in
Backing: Paratex non-woven and 0.8 in mineral fiber mat
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.60
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.65 | 0.75 | 0.65 | 0.45 | 0.25 |
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Value from the PTB table, not verified
NRC: 0.60 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 · 53 mm | 0.60 | 0.12 | 0.32 | 0.44 | 0.53 | 0.67 | 0.80 | 0.77 | 0.73 | 0.79 | 0.72 | 0.65 | 0.61 | 0.48 | 0.42 | 0.39 | 0.28 | 0.26 | 0.24 |
Measured values as a table (1 measurement)
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