Specially upholstered chair, occupied, vinyl cover, 2 cm back/4-6 cm seat upholstery

PTB reference data

Original description

Material properties

No further information available.

Reverberation chamber (ASTM C423 / ISO 354)

Values per m² of audience area, not per chair or person.

NRC

0.65

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.45	0.60	0.60	0.65	0.70	0.70

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Value from the PTB table, not verified

NRC: 0.65 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Specially upholstered chair, occupied, vinyl cover, 2 cm back/4-6 cm seat upholstery: 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
Measurement 1	0.65	0.44	0.58	0.62	0.67	0.68	0.72

Measured values as a table (1 measurement)

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Last updated: 09/15/2026