Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-6
Value from the PTB table, not verified
Perforated brick, glazed, with mineral fiber backing
PTB reference data
Original description
Perforated brick, glazed, with mineral fiber backing
Material properties
Thickness: 2 in
Wall distance: 1 in
Perforation: 17%
Backing: 0.4 in mineral fiber
Surface: glazed
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) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.15 | 0.55 | 0.45 | 0.35 | 0.25 |
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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 | 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 | 0.35 | 0.00 | 0.12 | 0.11 | 0.15 | 0.32 | 0.56 | 0.70 | 0.65 | 0.42 | 0.35 | 0.32 | 0.35 | 0.32 | 0.38 | 0.24 | 0.20 | 0.18 |
Measured values as a table (1 measurement)
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