FoamHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter http://www.optac.de, Feb. 2001
Value from the PTB table, not verified
OPTACust Noppe OCP-NOP-50 polyurethane foam
OPTACust Noppe OCP-NOP-50
PTB reference data
Original description
OPTACust Noppe OCP-NOP-50 polyurethane foam
Material properties
Manufacturer: SINOtec GmbH
Thickness: 2 in
Wall distance: 0 in
Application: ceiling, machine housing
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 | 0.15 | 0.20 | 0.50 | 0.80 | 0.90 | 1.00 |
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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 | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 50 · 25 kg/m^3, · 0 · Aufkleben · offenporige Oberfläche with Noppenstruktur | 0.60 | 0.13 | 0.20 | 0.52 | 0.80 | 0.90 | 1.00 |
Measured values as a table (1 measurement)
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