Mineral woolHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: Harris:Handbook of Acoustical Measurements and Noise Control, McGraw Hill 1991

Value from the PTB table, not verified

Fiberglass boards and blankets, 5.1 cm glass wool, 24 to 48 kg/m³, thickness 51 mm

PTB reference data

Original description

Material properties

Thickness: 51 mm

Density: 24 to 48 kg/m³

ISO 354 – reverberation chamber

α_w

0.80

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.15	0.55	0.80	0.90	0.85	0.80

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Value from the PTB table, not verified

Measured values as a table (1 measurement)

Fiberglass boards and blankets, 5.1 cm glass wool, 24 to 48 kg/m³, thickness 51 mm: 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
51 mm	0.80	0.17	0.55	0.80	0.90	0.85	0.80

Measured values as a table (1 measurement)

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Last updated: 02/09/2026