Manufacturer

Hiss Reet

Hiss Reet GmbH from Bad Oldesloe (Schleswig-Holstein) was founded in 1833 and has grown since the 1920s into Germany's largest thatch merchant. The family business harvests and processes reed in its own operations and supplies natural reed building materials across much of Europe. Alongside classic roofing thatch, the programme covers reed boards, insulation materials, partition systems and acoustic elements. The Akustik Absorber combines the characteristic stubble look of hand-selected reed stalks with sound absorption measured in a reverberation room.

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Datasheet

Hiss Reet acoustic absorber

Name: Hiss Reet acoustic absorber
Brand: Hiss Reet

WallCeiling

Description

The Hiss Reet acoustic absorber is a modular sound-absorbing element made of hand-selected reed. The upright stalks are fixed with a special foam onto a plasterboard carrier board; the visible end faces create the characteristic stubble look. Using the plug-in system, the 50 × 50 cm modules can be mounted on walls and ceilings, either directly or via a Knauf CD suspension system. The sound absorption has been measured in the reverberation room of Fachhochschule Lübeck per EN ISO 354 (le-acoustics, report VKA215029-P1): in all three tested installation heights E-265, E-400 and E-600 the element reaches αw 0.75 and sound absorption class C per EN ISO 11654, with a full third-octave curve for each build-up. Alongside the standard element, a light-shaft element with an integrated aluminium light shaft and an architects’ material sample are available.

Technical data

Material: Reed (thatching reed), hand-selected; visible stalk end faces in a stubble look

Up to fire class: B2 per DIN 4102 (not dripping, not falling off); B1 possible according to the manufacturer

Application: Wall and ceiling mounting; office, retail, hospitality and living spaces

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 3 variants

α_w

0.75

Frequency values

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.55	0.65	0.80	0.85	0.85

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Compare		Value
	85 mm Air cavity (Installationshöhe E-265)	α_w0.75
	220 mm Air cavity (Installationshöhe E-400)	α_w0.75
	420 mm Air cavity (Installationshöhe E-600)	α_w0.75

Absorber class: C

Test report: VKA215029-P1 / VKA215029-M1

Institute: le-acoustics (Hamburg), reverberation room FH Lübeck

Measurement date: 2015-10-08

Room volume: 186.4 m³

Object area: 13.4 m²

Application: Wand-/Deckenmontage, suspended bzw. with wall standoff

Measured values as a table (3 measurements)

Hiss Reet acoustic absorber: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	Absorber class	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
180 mm · 85 mm Air cavity (Installationshöhe E-265) · Wand-/Deckenmontage, suspended bzw. with wall standoff	0.75	C	0.08	0.17	0.39	0.55	0.59	0.56	0.64	0.62	0.68	0.72	0.82	0.82	0.82	0.83	0.85	0.85	0.87	0.85
180 mm · 220 mm Air cavity (Installationshöhe E-400) · Wand-/Deckenmontage, suspended bzw. with wall standoff	0.75	C	0.13	0.24	0.41	0.54	0.64	0.55	0.62	0.62	0.66	0.71	0.79	0.85	0.84	0.83	0.89	0.87	0.85	0.81
180 mm · 420 mm Air cavity (Installationshöhe E-600) · Wand-/Deckenmontage, suspended bzw. with wall standoff	0.75	C	0.13	0.31	0.36	0.53	0.64	0.63	0.61	0.65	0.64	0.72	0.81	0.86	0.84	0.87	0.89	0.87	0.88	0.85

Measured values as a table (3 measurements)

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Last updated: 17/09/2026

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