Ecophon Hygiene Protec A II glass wool fiber absorber

Ecophon – Hygiene Protec A II

PTB reference data

Original description

Material properties

Manufacturer: Ecophon GmbH

Thickness: 0.8 in

Wall distance: 7.9 in

Surface: Akutex T surface

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.85

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.50	0.75	0.80	0.85	0.95	0.90

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Value from the PTB table, not verified

NRC: 0.85 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Ecophon Hygiene Protec A II glass wool fiber absorber: 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
20 mm · ca. 4 kg / m² incl. Unterkonstruktion · tKh = 200 mm (totale Konstruktionshöhe) · Für Bereiche with relativ geringer Verschmutzung, Lebensmittel-, Arzneimittel-, Elektronikindustrie and überall dort, wo wo sämtliche Flächen des Absorbers gereinigt werden müssen, hochdruckreinigungsfähig · Akutex T verstärkt	0.85	0.50	0.75	0.80	0.85	0.95	0.90

Measured values as a table (1 measurement)

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Last updated: 09/02/2026