Mineral woolHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 68

Value from the PTB table, not verified

AMF Thermatex mineral fiber panel, irregularly perforated

irregularly perforated

PTB reference data

Original description

Material properties

Manufacturer: AMF - Mineralplatten GmbH Betriebs KG

Thickness: 20 mm

Wall distance: 400 mm

Dimensions: 300 x 300 mm to 1250 x 1250 mm

Surface weight: 7.4 kg/m²

Perforation: perforated

Hole size: 4 mm

Up to fire class: fire-resistant

ISO 354 – reverberation chamber

α_w

0.65

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.55	0.45	0.55	0.75	0.75	0.60

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Value from the PTB table, not verified

Measured values as a table (1 measurement)

AMF Thermatex mineral fiber panel, irregularly perforated: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz
20 mm · 7,4 kg / m² · 400 mm	0.65	0.60	0.54	0.48	0.42	0.46	0.50	0.55	0.62	0.68	0.75	0.76	0.78	0.80	0.71	0.63	0.55

Measured values as a table (1 measurement)

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Last updated: 02/09/2026