Ecophon Focus Quadro Glass Wool Panel, Akutex T

Ecophon – Focus Quadro 300 and 450 concave and convex

PTB reference data

Original description

Material properties

Manufacturer: Ecophon GmbH

Thickness: 0.8 in

Wall distance: 7.9 in

Surface: Akutex T treated

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	0.45	0.80	0.85	0.85	0.95	0.95

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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 Focus Quadro Glass Wool Panel, Akutex T: 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) · Deckenelement, for sanfte Übergänge unterschiedlicher Deckenhöhen, Höhenunterschied 300 mm or 450 mm · Akutex T	0.85	0.45	0.80	0.85	0.85	0.95	0.95

Measured values as a table (1 measurement)

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Last updated: 09/02/2026