Perforated drywall cassette with glass veil

PTB reference data

Original description

Material properties

Wall distance: 100 mm

Perforation: 0.5 %

Hole size: 6 mm

Backing: glass veil

Mounting: 50/50 battening on 550 mm x 1150 mm grid

ISO 354 – reverberation chamber

αw

0.14

αp nach ISO 11654

125 Hz

0.30

250 Hz

0.25

500 Hz

0.10

1000 Hz

0.05

2000 Hz

0.00

4000 Hz

0.10

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Method (354): Measured