Micro-perforated acrylic glass sound absorber

PTB reference data

Original description

Material properties

Thickness: 5 mm

Wall distance: 100 mm, 25 mm, 50 mm

ISO 354 – reverberation chamber· 4 variants

αw

0.43

αp per ISO 11654

f (Hz)	63	125	250	500	1k	2k
αp	0.15	0.25	0.60	0.85	0.50	0.25

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		Value
100 mm	Lochdurchmesser 0,55 mm, Lochabstand 3,5 mm	αw0.43
100 mm	Lochdurchmesser 0,8 mm, Lochabstand 6 mm, Lochflächenanteil 0,0140 %	αw0.29
50 mm	Lochdurchmesser 0,55 mm, Lochabstand 3,5 mm, Lochflächenanteil 0,0207%	αw0.26
25 mm	Lochdurchmesser 0,65 mm, Lochabstand 4 mm, Lochflächenanteil 0,0314 %	αw0.25