StoneHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-16
Perforated asbestos cement cassette with non-woven fiber
PTB reference data
Original description
Perforated asbestos cement cassette with non-woven fiber
Material properties
Thickness: 4 mm + non-woven fiber
Wall distance: 100 mm
Dimensions: 600 x 600 mm
Perforation: 17%
Hole size: 6 mm
Backing: Non-woven fiber 15.5 Rayl
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.59
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.85 | 0.80 | 0.60 | 0.55 |
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Method (354): Measured