Ecophon Master A/Beta glass wool panel, non-woven faced

Ecophon – Master A, beta + Master Extra Bass

PTB reference data

Original description

Material properties

Manufacturer: Ecophon GmbH

Thickness: 5.5 in

Wall distance: 7.9 in

Backing: non-woven faced

Surface: surface structure

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.80

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.80	0.75	0.80	0.85	0.75	0.60

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Value from the PTB table, not verified

NRC: 0.80 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Ecophon Master A/Beta glass wool panel, non-woven faced: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	63 Hz	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
140 mm · ca. 5 kg / m² incl. Unterkonstruktion · tKh = 200 mm (totale Konstruktionshöhe) · Deckenelement, demontierbar, Unterkonstruktion sichtbar, for Schulen and überall dort, wo die Anforderungen an eine gute Sprachverständlichkeit besonders hoch sind	0.80	0.60	0.80	0.75	0.80	0.85	0.75	0.60

Measured values as a table (1 measurement)

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Last updated: 09/02/2026