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: 0.8 in, 1.2 in

Wall distance: 0 in, 2 in

Backing: perforated gypsum board (perforation ratio 20%)

Up to fire class: non-combustible

Reverberation chamber (ASTM C423 / ISO 354)· 6 variants

NRC

0.75

α_p per octave band

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
1.2 in	20 kg / m²	2 in	NRC0.75
0.8 in	20 kg / m³	2 in	NRC0.65
1.2 in	20 kg / m²	0	NRC0.70
0.8 in	20 kg / m³	0	NRC0.55
0.8 in	20 kg / m³	2 in with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	NRC0.60
1.2 in	20 kg / m²	2 in with gelochter Gipskartonplatte abgedeckt, Lochanteil 20 %	NRC0.70

NRC: 0.75 (derived from ISO 354 lab data)

Dimensions: 1250 x 24 in

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	NRC	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	0.55	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 %	0.60	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	0.70	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 %	0.70	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: 09/02/2026