Mineral woolHigh-frequency absorber

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 118

Value from the PTB table, not verified

Isover P3 mineral fiber sound absorber panel, non-combustible

Isover sound absorber panel – P3

PTB reference data

Original description

Material properties

Manufacturer: Saint-Gobain Isover G+H AG

Thickness: 20 mm, 30 mm

Wall distance: 0 mm, 50 mm

Backing: perforated gypsum board (perforation ratio 20%)

Up to fire class: non-combustible

ISO 354 – reverberation chamber· 6 variants

α_w

0.75

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.25	0.50	0.75	0.90	0.95	1.00

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			Value
30 mm	20 kg / m²	50 mm	α_w0.75
20 mm	20 kg / m³	50 mm	α_w0.65
30 mm	20 kg / m²	0	α_w0.60
20 mm	20 kg / m³	0	α_w0.50
20 mm	20 kg / m³	50 mm with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	α_w0.40
30 mm	20 kg / m²	50 mm with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	α_w0.40

Dimensions: 1250 x 600 mm

Measured values as a table (6 measurements)

Isover P3 mineral fiber sound absorber panel, non-combustible: 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 · 20 kg / m³ · 0	0.50	0.14	0.16	0.20	0.23	0.30	0.40	0.47	0.55	0.63	0.73	0.78	0.81	0.84	0.85	0.90	0.93
20 mm · 20 kg / m³ · 50 mm	0.65	0.16	0.21	0.27	0.33	0.43	0.56	0.64	0.72	0.81	0.90	0.87	0.84	0.82	0.85	0.93	1.01
20 mm · 20 kg / m³ · 50 mm with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	0.40	0.16	0.23	0.32	0.40	0.59	0.78	0.90	0.83	0.77	0.73	0.60	0.50	0.40	0.33	0.23	0.17
30 mm · 20 kg / m² · 0	0.60	0.16	0.19	0.22	0.27	0.40	0.59	0.73	0.76	0.80	0.84	0.87	0.92	0.96	0.94	0.93	0.92
30 mm · 20 kg / m² · 50 mm	0.75	0.23	0.30	0.40	0.46	0.57	0.65	0.76	0.81	0.85	0.92	0.92	0.92	0.93	0.97	1.00	1.03
30 mm · 20 kg / m² · 50 mm with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	0.40	0.20	0.30	0.42	0.54	0.67	0.83	0.99	0.90	0.82	0.73	0.63	0.55	0.47	0.36	0.23	0.12

Measured values as a table (6 measurements)

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Last updated: 02/09/2026