Heavily upholstered chair, occupied, seat back 7.5 cm, seat bottom 10 cm, arm rests 2 cm, Kanagawa (series 4)

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

0.80

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.70	0.75	0.75	0.75	0.85	0.90

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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)

Heavily upholstered chair, occupied, seat back 7.5 cm, seat bottom 10 cm, arm rests 2 cm, Kanagawa (series 4): 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	0.80	0.68	0.74	0.77	0.77	0.84	0.89

Measured values as a table (1 measurement)

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Last updated: 09/04/2026