Perforated metal cassette with mineral fiber backing

PTB reference data

Original description

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

ISO 354 – reverberation chamber

αw

0.71

αp nach ISO 11654

125 Hz

0.50

250 Hz

0.80

500 Hz

0.75

1000 Hz

0.80

2000 Hz

0.85

4000 Hz

0.75

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Method (354): Measured