MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-15
Perforated metal cassette with mineral fiber backing
PTB reference data
Original description
Perforated metal cassette with mineral fiber backing
Material properties
Wall distance: 350 mm
Dimensions: 625 x 625 mm
Perforation: 16%
Hole size: 2.5 mm
Backing: 20 mm thick mineral fiber panel, 2 kg/m², in 0.03 mm polyethylene foil
Flow resistance: 0.06 kPa·s/m
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.71
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.50 | 0.80 | 0.75 | 0.80 | 0.85 | 0.75 |
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Method (354): Measured
