Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter http://asonad.de, March 2002
Value from the PTB table, not verified
Soundblox Type E2 hollow concrete block with Helmholtz resonators
Helmholtz resonator – SOUNDBLOX Type E2
PTB reference data
Original description
Soundblox Type E2 hollow concrete block with Helmholtz resonators
Material properties
Manufacturer: Asona Deutschland GmbH
Up to fire class: F-180
Application: fair-faced concrete masonry
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.70
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.35 | 1.00 | 0.75 | 0.60 | 0.65 |
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Value from the PTB table, not verified
NRC: 0.70 (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 | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.70 | 0.12 | 0.06 | 0.13 | 0.22 | 0.31 | 0.56 | 0.84 | 1.09 | 1.08 | 0.92 | 0.75 | 0.63 | 0.59 | 0.57 | 0.58 | 0.61 | 0.68 | 0.59 | 0.48 | 0.37 |
Measured values as a table (1 measurement)
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