Stone & concreteBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-2
Value from the PTB table, not verified
Facing brick masonry with mineral fiber infill
PTB reference data
Original description
Facing brick masonry with mineral fiber infill
Material properties
Thickness: 55 mm
Wall distance: 50 mm
Dimensions: 230 x 50 x 55 mm
Backing: 50 mm mineral fiber panels, 100 kg/m³
Flow resistance: 20 Rayl
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.30
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.55 | 0.70 | 0.30 | 0.20 | 0.35 | 0.35 |
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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 | 4000 Hz | 5000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 55 mm · 50 mm | 0.30 | 0.30 | 0.53 | 0.78 | 0.85 | 0.74 | 0.50 | 0.33 | 0.27 | 0.23 | 0.20 | 0.20 | 0.21 | 0.28 | 0.34 | 0.40 | 0.38 | 0.34 | 0.34 | 0.32 |
Measured values as a table (1 measurement)
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