Perforated gypsum board, 12/20 mm hole diameter

PTB reference data

Original description

Material properties

Thickness: 12.5 mm

Wall distance: 30 mm

Perforation: 20.2%

Hole size: 12 mm, 20 mm

Mounting: on batten sub-frame in a 625 x 625 mm grid

ISO 354 – reverberation chamber

αw

0.31

αp nach ISO 11654

125 Hz

0.05

250 Hz

0.15

500 Hz

0.45

1000 Hz

0.65

2000 Hz

0.25

4000 Hz

0.20

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Method (354): Measured