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
SINOtec OPTACust Waffel soft foam
OPTACust Waffel
PTB reference data
Original description
SINOtec OPTACust Waffel soft foam
Material properties
Manufacturer: SINOtec GmbH
Thickness: 1.4 in, 2 in
Wall distance: 0 in
Application: ceiling, machine housing
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.70
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.25 | 0.60 | 0.90 | 1.00 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 50 | NRC0.70 | |
| 35 | NRC0.55 |
NRC: 0.70 (derived from ISO 354 lab data)
Weight / density: Pu 30 kg/m^3, Melaminharz 11 kg/m^3
Dimensions: 39 in x 39 in bzw 49 in x 24 in
Application: Aufkleben
Distance: 0
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 35 · Pu 30 kg/m^3, Melaminharz 11 kg/m^3 · 0 · Aufkleben · offenporige Oberfläche with Waffelstruktur | 0.55 | 0.10 | 0.20 | 0.45 | 0.70 | 0.83 | 0.90 |
| 50 · Pu 30 kg/m^3, Melaminharz 11 kg/m^3 · 0 · Aufkleben · offenporige Oberfläche with Waffelstruktur | 0.70 | 0.18 | 0.25 | 0.60 | 0.92 | 1.02 | 1.08 |
Measured values as a table (2 measurements)
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