Specially upholstered chair, unoccupied, front side of seat back 65 %, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet (series 2)

PTB reference data

Original description

Material properties

No further information available.

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)

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

NRC

0.35

derived from ISO 354 lab data

Frequency values

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.40	0.35	0.40	0.35	0.35	0.25

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Value from the PTB table, not verified

NRC: 0.35 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Specially upholstered chair, unoccupied, front side of seat back 65 %, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet (series 2): 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	0.35	0.38	0.35	0.40	0.37	0.34	0.25

Measured values as a table (1 measurement)

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Last updated: 09/04/2026