FeltHigh-frequency absorber

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 183

Value from the PTB table, not verified

Idikell Series 6000 textile fiber absorber mats

Idikell – Series 6000, without foil facing

PTB reference data

Original description

Material properties

Manufacturer: Siegfried Keller AG

Thickness: 0.3 in, 0.6 in, 0.8 in, 1.3 in

Wall distance: 0 in

Surface: without foil facing

Up to fire class: self-extinguishing

Reverberation chamber (ASTM C423 / ISO 354)· 4 variants

NRC

0.55

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.10	0.15	0.40	0.70	0.95	1.00

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NRC: 0.55 (derived from ISO 354 lab data)

Weight / density: 40 - 60 kg / m³

Distance: 0, without Folienabdeckung

Measured values as a table (4 measurements)

Idikell Series 6000 textile fiber absorber mats: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	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	5000 Hz	6300 Hz
8 mm · 40 - 60 kg / m³ · 0, without Folienabdeckung	0.15	0.05	0.05	0.05	0.05	0.05	0.06	0.07	0.08	0.12	0.09	0.13	0.18	0.19	0.26	0.27	0.36	0.42	0.48	0.52
14 mm · 40 - 60 kg / m³ · 0, without Folienabdeckung	0.25	0.02	0.03	0.04	0.05	0.06	0.08	0.10	0.13	0.18	0.20	0.27	0.28	0.40	0.47	0.60	0.72	0.83	0.89	0.95
20 mm · 40 - 60 kg / m³ · 0, without Folienabdeckung	0.35	0.07	0.07	0.07	0.07	0.07	0.10	0.13	0.20	0.25	0.27	0.41	0.47	0.63	0.75	0.87	0.93	0.97	0.96	0.98
32 mm · 40 - 60 kg / m³ · 0, without Folienabdeckung	0.55	0.10	0.10	0.11	0.11	0.14	0.22	0.30	0.42	0.52	0.61	0.73	0.81	0.87	0.92	1.00	0.99	1.00	0.99	1.00

Measured values as a table (4 measurements)

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Last updated: 09/04/2026