Rockwool blanket, 4 inch thick batt (Full-Thik), covered with 3/16 inch thick perforated cement asbestos board (Transite), 11% open area, mounted against solid backing

PTB reference data

Original description

Material properties

Thickness: 4 in, 0.2 in

Perforation: 11%

Mounting: against solid backing

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.80

derived from ISO 354 lab data

Frequency values

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.50	0.90	1.00	0.75	0.55	0.45

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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 blanket, 4 inch thick batt (Full-Thik), covered with 3/16 inch thick perforated cement asbestos board (Transite), 11% open area, mounted against solid backing: 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	0.50	0.88	0.99	0.75	0.56	0.45

Measured values as a table (1 measurement)

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Last updated: 08/28/2026