Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b3-7 b
Value from the PTB table, not verified
Perforated brick with mineral fiber mat backing
PTB reference data
Original description
Perforated brick with mineral fiber mat backing
Material properties
Thickness: 2.4 in
Wall distance: 7.9 in
Dimensions: 240 × 240 × 2.4 in
Perforation: 40%
Hole size: 10.5 × 0.4 in
Backing: 2 layers of mineral fiber mats quilted on wire mesh
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
1.05
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 1.00 | 1.00 | 0.95 | 1.00 | 0.90 |
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Value from the PTB table, not verified
NRC: 1.05 (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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 60 mm · 200 mm | 1.05 | 0.62 | 0.75 | 0.98 | 1.20 | 1.06 | 1.05 | 1.02 | 1.05 | 1.02 | 1.02 | 0.94 | 0.95 | 0.97 | 1.05 | 1.10 | 0.98 | 0.79 | 0.98 | 0.82 |
Measured values as a table (1 measurement)
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