MetalLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter www.ibp.fhg.de/rata
Value from the PTB table, not verified
Fraunhofer IBP VPR-A1 compound plate resonator with ISO-Bond filling
VPR – A1 with Caruso ISO-Bond filling
PTB reference data
Original description
Fraunhofer IBP VPR-A1 compound plate resonator with ISO-Bond filling
Material properties
Manufacturer: Fraunhofer IBP
Thickness: 3.9 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 1.00 | 0.85 | 0.60 | 0.35 | 0.25 | 0.20 |
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Value from the PTB table, not verified
NRC: 0.50 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 80 Hz | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 mm · 21 kg | 0.50 | 0.80 | 1.05 | 1.07 | 1.15 | 0.86 | 0.94 | 0.83 | 0.73 | 0.67 | 0.58 | 0.54 | 0.40 | 0.38 | 0.34 | 0.32 | 0.25 | 0.22 | 0.26 | 0.15 |
Measured values as a table (1 measurement)
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