Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-5
Value from the PTB table, not verified
Perforated brick, 250 x 125 x 50 mm, glazed, 17% perforation ratio
PTB reference data
Original description
Perforated brick, 250 x 125 x 50 mm, glazed, 17% perforation ratio
Material properties
Thickness: 50 mm
Wall distance: 25 mm
Perforation: 17%
Surface: glazed
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.20
Frequency values
αp nach ISO 11654
| f (Hz) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.05 | 0.15 | 0.20 | 0.15 | 0.10 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 mm · 25 mm | 0.20 | 0.00 | 0.04 | 0.06 | 0.02 | 0.05 | 0.13 | 0.22 | 0.22 | 0.20 | 0.15 | 0.13 | 0.14 | 0.20 | 0.18 | 0.10 | 0.05 | 0.00 |
Measured values as a table (1 measurement)
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