Manufacturer

Lindner Group

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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Documents

Fire protection Datasheet LMD-St 213 Datasheet LMD-St 214 Datasheet LMD-St 700 BWS Datasheet acoustic insert Calma Datasheet acoustic insert Acustica Datasheet expanded metal MESHdesign

Expanded metal ceiling LMD-St

Name: Expanded metal ceiling LMD-St
Brand: Lindner Group

Description

Expanded metal ceiling with an open mesh structure. From about 30 percent open area the mesh counts as acoustically transparent, and the absorption is then determined by the acoustic insert of Acustica or Calma. Recycled content 24.3 percent.

Technical data

Material: galvanised sheet steel, expanded metal of steel

Surface: Powder coating COLOURline, MOODline deep matt, expanded metal MESHdesign

Up to fire class: A2-s1,d0

Certifications: CE per EN 13964, EPD per EN 15804, TAIM Technical Manual for Metal Ceilings, VOC emission class A+, Indoor Air Comfort Gold, Oeko-Tex Standard 100 (Acustica and Calma acoustic inserts)

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 8 variants

NRC

0.90

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.55	0.80	0.95	0.95	1.00	0.90

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			Value
62 x 23 x 3 x 2,5	with acoustic fleece	1.2 in Insula A2	NRC0.90
62 x 20 x 7,5 x 2,0	with acoustic fleece	0.8 in Insula B1	NRC0.90
62 x 20 x 7,5 x 2,0	with acoustic fleece	1.2 in Acustica	NRC0.90
62 x 20 x 7,5 x 2,0	without acoustic fleece	0.8 in Insula B1	NRC0.90
62 x 20 x 7,5 x 2,0	with acoustic fleece	1 in Calma	NRC0.90
62 x 20 x 7,5 x 2,0	without acoustic fleece	1 in Calma	NRC0.90
62 x 20 x 7,5 x 2,0	without acoustic fleece	1.2 in Acustica	NRC0.80
62 x 20 x 7,5 x 2,0	without acoustic fleece	0.8 in Acustica	NRC0.70

Test report: H100923_2

NRC: 0.90 (derived from ISO 354 lab data)

Distance: 7.9 in

Measured values as a table (8 measurements)

Expanded metal ceiling LMD-St: 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
62 x 23 x 3 x 2,5 · 200 mm · with acoustic fleece	0.90	0.43	0.55	0.64	0.62	0.83	0.92	0.90	0.95	0.94	0.91	0.93	0.98	0.99	0.97	0.98	0.95	0.90	0.87
62 x 20 x 7,5 x 2,0 · 200 mm · with acoustic fleece	0.90	0.28	0.43	0.48	0.76	0.74	0.84	1.03	1.02	0.97	0.88	0.87	0.99	1.01	1.00	0.98	0.96	0.92	0.90
62 x 20 x 7,5 x 2,0 · 200 mm · with acoustic fleece	0.90	0.23	0.30	0.46	0.69	0.69	0.81	1.00	0.99	0.96	0.91	0.84	0.95	1.00	1.00	1.00	1.00	1.00	1.00
62 x 20 x 7,5 x 2,0 · 200 mm · without acoustic fleece	0.90	0.27	0.42	0.49	0.73	0.74	0.82	1.02	1.02	0.97	0.91	0.86	0.96	1.02	1.00	0.97	0.93	0.86	0.82
62 x 20 x 7,5 x 2,0 · 200 mm · with acoustic fleece	0.90	0.21	0.42	0.49	0.82	0.81	0.84	0.90	0.89	0.88	0.85	0.90	0.98	1.01	1.03	1.03	1.04	1.05	1.03
62 x 20 x 7,5 x 2,0 · 200 mm · without acoustic fleece	0.90	0.14	0.28	0.44	0.74	0.80	0.81	0.88	0.88	0.86	0.85	0.89	0.97	0.98	1.01	1.03	1.01	1.00	0.98
62 x 20 x 7,5 x 2,0 · 200 mm · without acoustic fleece	0.70	0.13	0.16	0.30	0.46	0.51	0.64	0.79	0.81	0.80	0.76	0.70	0.78	0.86	0.84	0.86	0.86	0.86	0.88
62 x 20 x 7,5 x 2,0 · 200 mm · without acoustic fleece	0.80	0.16	0.21	0.36	0.58	0.62	0.77	0.91	0.92	0.90	0.87	0.81	0.89	0.95	0.93	0.94	0.93	0.93	0.92

Measured values as a table (8 measurements)

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Last updated: 09/16/2026