Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-4
Value from the PTB table, not verified
Solid brick masonry with open butt joints
PTB reference data
Original description
Solid brick masonry with open butt joints
Material properties
Thickness: 3.9 in
Wall distance: 1.2 in
Dimensions: 207 x 100 x 2.2 in
Perforation: 7 %
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.35
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.35 | 0.30 | 0.30 | 0.45 | 0.45 |
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Value from the PTB table, not verified
NRC: 0.35 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 mm · 30 mm | 0.35 | 0.18 | 0.06 | 0.15 | 0.18 | 0.44 | 0.40 | 0.30 | 0.30 | 0.30 | 0.23 | 0.31 | 0.35 | 0.57 | 0.42 | 0.38 | 0.42 | 0.45 | 0.50 | 0.48 |
Measured values as a table (1 measurement)
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