RockWool thickness=50 mm d=110 kg/m³ (series 2)

PTB reference data

Original description

Material properties

Thickness: 2 in

Density: 110 kg/m³

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.80

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.25	0.65	0.90	0.90	0.85	0.85

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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)

RockWool thickness=50 mm d=110 kg/m³ (series 2): 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	0.80	0.00	0.24	0.66	0.88	0.88	0.87	0.87	0.87

Measured values as a table (1 measurement)

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Last updated: 09/02/2026