illbruck illsonic waterproof PE foam resonator panel

illsonic waterproof Resonator-Struktur

PTB reference data

Original description

Material properties

Manufacturer: illbruck GmbH

Thickness: 2.2 in

Wall distance: 2 in

Surface: closed-cell with resonator structure

Application: hygiene area

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.50

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.10	0.30	0.40	0.35	0.85	0.30

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Value from the PTB table, not verified

NRC: 0.50 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

illbruck illsonic waterproof PE foam resonator panel: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
55 mm · 33 kg/m^3 · 50 mm · 100% geschlossenporige PE-Schaumkunststoff-Oberfläche. Rippenstruktur with Hohlräumen	0.50	0.09	0.29	0.41	0.37	0.86	0.28

Measured values as a table (1 measurement)

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Last updated: 09/02/2026