Lindner Group, Arnstorf: metal ceilings, heating and cooling ceilings, raised floors, wall and ceiling linings and the MUTE+ sound absorber line.

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NORTEC acoustic raised floor type 4

Name: NORTEC acoustic raised floor type 4
Brand: Lindner Group

Description

NORTEC acoustic raised floor type 4: perforated floor panel with a qualified floor covering and acoustic tray.

Material: perforated raised floor panel of fibre-reinforced calcium sulphate, HF-coated on the underside

Surface: qualified, acoustically effective floor covering, WOODline possible

Up to fire class: A1 — Carrier board per EN 13501-1, non-combustible

Certifications: IBR test mark of the Institut für Baubiologie Rosenheim (VOC, biocides, heavy metals, radioactivity)

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

NRC

0.65

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.35	0.55	0.85	0.65	0.65	0.80

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Compare		Value
	Oberbelag Desso Palatino	NRC0.65
	Oberbelag Vebe Strong 956	NRC0.60
	Oberbelag Anker Element EVA Klimafliese	NRC0.50
	Oberbelag Fabromont Orbital	NRC0.55

NRC: 0.65 (derived from ISO 354 lab data)

Perforation: perforated floor panel, qualified floor covering, acoustic tray

Measured values as a table (4 measurements)

NORTEC acoustic raised floor type 4: 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
perforated floor panel, qualified floor covering, acoustic tray · Oberbelag Fabromont Orbital	0.55	0.33	0.37	0.32	0.38	0.49	0.56	0.77	0.78	0.65	0.53	0.43	0.37	0.37	0.43	0.55	0.77	0.76	0.66
perforated floor panel, qualified floor covering, acoustic tray · Oberbelag Vebe Strong 956	0.60	0.36	0.39	0.32	0.38	0.46	0.50	0.79	0.99	0.77	0.62	0.49	0.45	0.46	0.51	0.58	0.76	0.91	0.72
perforated floor panel, qualified floor covering, acoustic tray · Oberbelag Anker Element EVA Klimafliese	0.50	0.27	0.25	0.31	0.38	0.47	0.71	0.71	0.61	0.50	0.47	0.45	0.46	0.47	0.56	0.64	0.66	0.65	0.76
perforated floor panel, qualified floor covering, acoustic tray · Oberbelag Desso Palatino	0.65	0.35	0.35	0.41	0.41	0.54	0.69	0.87	0.86	0.79	0.70	0.60	0.58	0.57	0.63	0.71	0.77	0.80	0.81

Measured values as a table (4 measurements)

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Last updated: 09/14/2026