Absoflex panels "HYGIENE" thickness=0.03 mm

PTB reference data

Original description

Material properties

Thickness: 0 in

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	0.25	0.50	0.95	0.95	0.90	0.80

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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)

Absoflex panels "HYGIENE" thickness=0.03 mm: 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	8000 Hz
Measurement 1	0.85	0.08	0.27	0.50	0.95	0.95	0.91	0.82	0.50

Measured values as a table (1 measurement)

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Last updated: 09/04/2026