MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 215
Value from the PTB table, not verified
Nagelsturz + Eichler NE-Zweckform ceiling Type 85/15 (series 2)
NE-Zweckform ceiling – Type 85/15
PTB reference data
Original description
Nagelsturz + Eichler NE-Zweckform ceiling Type 85/15 (series 2)
Material properties
Manufacturer: Nagelsturz + Eichler GmbH & Co KG
Thickness: 0.8 in
Perforation: 18%
Hole size: 0.2 in
Backing: 0.8 in mineral fiber layer with color coating on one side
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 | 0.35 | 0.70 | 0.70 | 0.75 | 0.70 | 0.85 |
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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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20,5 mm · 92,5 kg / m³ | 0.70 | 0.20 | 0.40 | 0.50 | 0.62 | 0.73 | 0.71 | 0.68 | 0.66 | 0.70 | 0.75 | 0.80 | 0.76 | 0.72 | 0.68 | 0.77 | 0.81 | 0.88 |
Measured values as a table (1 measurement)
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