MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 139
Value from the PTB table, not verified
Isover GEMA metal cassette ceiling with mineral fiber absorber
Metal cassette ceiling – System GEMA
PTB reference data
Original description
Isover GEMA metal cassette ceiling with mineral fiber absorber
Material properties
Manufacturer: Saint-Gobain Isover G+H AG
Thickness: approx. 0.8 in
Wall distance: 12 in
Perforation: approx. 20%
Hole size: 0.1 in
Backing: 0.8 in mineral fiber panels
Surface: perforated metal sheet, steel sheet
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.80
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.40 | 0.70 | 0.75 | 0.85 | 0.95 | 1.00 |
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Value from the PTB table, not verified
NRC: 0.80 (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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 20,5 mm · 5,3 - 6,8 kg / m² · 300 mm | 0.80 | 0.38 | 0.32 | 0.55 | 0.66 | 0.72 | 0.74 | 0.81 | 0.72 | 0.67 | 0.80 | 0.91 | 0.89 | 0.91 | 0.93 | 0.99 | 1.03 | 0.97 |
Measured values as a table (1 measurement)
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