Manufacturer

akustikplus GmbH & Co. KG

akustikplus develops and manufactures decorative acoustic solutions from wood-based materials at its site in Stephanskirchen near Rosenheim. The company belongs to the Hamberger Group and combines industrial production with real-wood veneer expertise. The range comprises four product lines: smartline (acoustic panels with an integrated wood-wool absorber), slimline (slender slotted panels mounted over a mineral-wool insulation layer), proline (micro-perforated acoustic boards, also available as a furniture board decorative on both sides) and designline (felt panels with veneered MDF slats). Non-combustible versions on a gypsum-fibre base are available on request.

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slimline invisible 16/3

Name: slimline invisible 16/3
Brand: akustikplus GmbH & Co. KG

WallCeiling

Description

The slimline is a slim, slotted MDF acoustic panel for mounting on a substructure. The acoustic effect results from the interplay of the slotted face with a mineral wool insulation layer behind it; depending on the build-up, an open cavity is added as well. The panels join into a continuous surface via a tongue-and-groove joint. In the invisible version the slots are cut at an angle and therefore do not appear visually. The surface reads as a closed timber wall while remaining acoustically open. Stronger substrate than the standard 16/3.

Technical data

Material: Substrate: 0.7 in MDF E1 (per Table 8 EN 13986); 16/0.7 in MDF E1 (B-s1,d0 per DIN EN 13501-1), drilled · Absorber: mineral wool (insulation layer behind the panel)

Surface: Real-wood veneer | CPL | melamine

Up to fire class: normally flammable (for substrate); flame-retardant C-s2,d0 per DIN EN 13501-1 (composite test); others on request

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 2 variants

NRC

0.85

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.60	1.00	1.00	0.80	0.60

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Compare		Value
	1.2 in mineral wool	NRC0.85
	2.4 in mineral wool	NRC0.95

NRC: 0.85 (derived from ISO 354 lab data)

Dimensions: Overall build-up 1.9 in

Distance: without cavity (direkt)

Measured values as a table (2 measurements)

slimline invisible 16/3: 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
without cavity (direkt) · 30 mm mineral wool	0.85	0.11	0.18	0.31	0.47	0.61	0.78	0.90	1.00	1.03	1.00	0.98	0.95	0.84	0.81	0.72	0.64	0.64	0.58
without cavity (direkt) · 60 mm mineral wool	0.95	0.24	0.41	0.69	0.88	1.04	1.06	1.04	1.01	0.98	0.88	0.89	0.88	0.84	0.83	0.79	0.67	0.61	0.57

Measured values as a table (2 measurements)

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Last updated: 08/22/2026