Heavily upholstered chair, unoccupied

PTB reference data

Original description

Material properties

Thickness: seat back front 3 in, seat top 3.9 in, arm rests 0.8 in

Application: chair

Reverberation chamber (ASTM C423 / ISO 354)

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

NRC

0.90

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.60	0.80	0.90	0.95	0.95	0.95

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Value from the PTB table, not verified

NRC: 0.90 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Heavily upholstered chair, unoccupied: 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	0.90	0.61	0.79	0.88	0.94	0.95	0.94

Measured values as a table (1 measurement)

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Last updated: 09/16/2026