Hairy carpet on 3 mm felt (g)

PTB reference data

Original description

Material properties

No further information available.

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.30

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.10	0.15	0.35	0.45	0.25	0.25

Create a permanent free account — Access frequency bands, variants and export.

Free. No password required.

Value from the PTB table, not verified

NRC: 0.30 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Hairy carpet on 3 mm felt (g): 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	0.30	0.08	0.11	0.14	0.37	0.43	0.27	0.25	0.25

Measured values as a table (1 measurement)

Access frequency bands, variants and export. Create a permanent free account

Last updated: 09/04/2026