StoneHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-17
Perforated asbestos cement cassette
PTB reference data
Original description
Perforated asbestos cement cassette
Material properties
Thickness: 4 mm
Wall distance: 24 mm
Dimensions: 600 × 600 mm
Perforation: 17%
Hole size: 6 mm
Backing: non-woven
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.09
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.00 | 0.00 | 0.05 | 0.10 | 0.20 | 0.20 |
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Method (354): Measured