Perforated metal ceiling with 30 mm mineral wool

PTB reference data

Original description

Material properties

Hole size: 3 mm

Backing: 30 mm mineral wool

Application: ceiling

ISO 354 – reverberation chamber

αw

0.70

αp nach ISO 11654

125 Hz

0.50

250 Hz

0.80

500 Hz

0.75

1000 Hz

0.70

2000 Hz

0.75

4000 Hz

0.70

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Method (354): Measured