Phenol-resin impregnated fiberglass, aluminized polyester film surface, self-extinguishing, can be washed or cleaned with high-pressure cleaner

GFSA-MEX

PTB reference data

Original description

Material properties

Manufacturer: Nordisk Akustik A/S

Thickness: 7 mm

Wall distance: 100 mm, 55 mm, 25 mm

Surface: aluminized polyester film

Up to fire class: self-extinguishing

ISO 354 – reverberation chamber· 3 variants

α_w

0.85

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.35	0.65	0.80	0.80	0.85	0.90

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Weight / density: 1,2 kg / m²

Dimensions: 1150 x 1300 mm

Measured values as a table (3 measurements)

Phenol-resin impregnated fiberglass, aluminized polyester film surface, self-extinguishing, can be washed or cleaned with high-pressure cleaner: 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
7 mm · 1,2 kg / m² · 100 mm · film surface, self extinguishing, easy to clean	0.85	0.28	0.40	0.60	0.65	0.70	0.80	0.85	0.82	0.80	0.80	0.80	0.80	0.85	0.90	0.90	0.90
7 mm · 1,2 kg / m² · 55 mm · film surface, self extinguishing, easy to clean	0.65	0.16	0.20	0.24	0.32	0.42	0.62	0.80	0.85	0.85	0.85	0.84	0.83	0.82	0.82	0.90	0.95
7 mm · 1,2 kg / m² · 25 mm · film surface, self extinguishing, easy to clean	0.45	0.08	0.10	0.12	0.16	0.22	0.50	0.60	0.68	0.78	0.83	0.84	0.86	0.89	0.90	0.91	0.92

Measured values as a table (3 measurements)

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Last updated: 02/09/2026