Perforated asbestos cement cassette with non-woven fiber

PTB reference data

Original description

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

ISO 354 – reverberation chamber

αw

0.59

αp nach ISO 11654

125 Hz

0.25

250 Hz

0.55

500 Hz

0.85

1000 Hz

0.80

2000 Hz

0.60

4000 Hz

0.55

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Method (354): Measured