MetalLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer's product sheet
Value from the PTB table, not verified
Kaefer VPR-Modul B2 (fiber-free compound panel resonator)
VPR-Modul B2
PTB reference data
Original description
Kaefer VPR-Modul B2 (fiber-free compound panel resonator)
Material properties
Manufacturer: Kaefer Isoliertechnik
Thickness: 100 mm
Surface: 2.5 mm steel front panel
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.00
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k |
|---|---|---|---|---|---|
| αp | 0.95 | 0.85 | 0.80 | 0.60 | 0.45 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 mm · white lackiert or pulverbeschichtet with Lochblechrahmen | 0.00 | 0.96 | 0.98 | 0.96 | 0.81 | 0.92 | 0.87 | 0.87 | 0.78 | 0.79 | 0.61 | 0.60 | 0.54 | 0.46 | 0.43 | 0.41 | 0.35 |
Measured values as a table (1 measurement)
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