Stone & concreteBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-18
Value from the PTB table, not verified
Perforated glazed stoneware molded element
PTB reference data
Original description
Perforated glazed stoneware molded element
Material properties
Thickness: 3.9 in to 4.7 in
Dimensions: 240 × 9.4 in
Hole size: conical from 0.7 in
Surface: glazed
Application: wall
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.95
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.40 | 1.00 | 1.00 | 0.80 | 0.60 | 0.75 |
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| Compare | Value |
|---|---|
| NRC0.95 | |
| NRC0.10 |
NRC: 0.95 (derived from ISO 354 lab data)
Dimensions: 240 x 9.4 in
Measured values as a table (2 measurements)
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.10 | 0.01 | 0.00 | 0.00 | 0.03 | 0.03 | 0.10 | 0.15 | 0.15 | 0.13 | 0.18 | 0.23 | 0.07 | 0.08 | 0.05 | 0.07 | 0.01 | 0.01 | 0.02 | 0.00 |
| Measurement 2 | 0.95 | 0.22 | 0.34 | 0.68 | 0.85 | 1.15 | 1.18 | 1.10 | 1.18 | 1.10 | 0.98 | 0.82 | 0.62 | 0.58 | 0.60 | 0.62 | 0.65 | 0.75 | 0.82 | 0.70 |
Measured values as a table (2 measurements)
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