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: 101.6 mm, 4.76 mm

Perforation: 11%

Mounting: against solid backing

Measurement data

Sound absorption

ISO 354 – reverberation chamber

α_w

0.60

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

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	α_w	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
Measurement 1	0.60	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: 28/08/2026