Plastic & filmHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter http://www.optac.de, March 2002
Value from the PTB table, not verified
SINOtec Stanac Helmholtz resonator made of closed-cell plastic
Stanac
PTB reference data
Original description
SINOtec Stanac Helmholtz resonator made of closed-cell plastic
Material properties
Manufacturer: SINOtec GmbH
Thickness: 1.4 in
Wall distance: 0 in, 0.4 in, 0.6 in
Up to fire class: highly flammable (B3 according to DIN 4102)
Application: wet areas
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
NRC
0.55
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.50 | 0.40 | 0.40 | 0.90 | 0.75 |
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| Compare | Value | |
|---|---|---|
| 0.6 in | NRC0.55 | |
| 0.4 in | NRC0.45 | |
| 0 | NRC0.30 |
NRC: 0.55 (derived from ISO 354 lab data)
Dimensions: 1000 x 1000 x 1.4 in
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 35 mm · 0 · geschlossenzellig | 0.30 | 0.09 | 0.09 | 0.10 | 0.20 | 0.73 | 0.70 |
| 35 mm · 10 mm · geschlossenzellig | 0.45 | 0.09 | 0.10 | 0.15 | 0.66 | 0.85 | 0.70 |
| 35 mm · 15 mm · geschlossenzellig | 0.55 | 0.09 | 0.50 | 0.40 | 0.42 | 0.90 | 0.75 |
Measured values as a table (3 measurements)
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