Manufacturer

Whisperwool

Tante Lotte Design GmbH from Innsbruck manufactures sound absorbers made of sheep wool under the Whisperwool brand. The material consists of virgin sheep wool, mostly from Tyrol and the rest of the Alpine region, recycled wool and recycled Whisperwool residues, bonded with a biodegradable binding fibre. The base board has a two-layer structure: a top layer of colour-sorted sheep wool over a hard, air-permeable core. It is the basis for acoustic boards for wall and ceiling, ceiling rafts, wall, window, hanging, floor-standing and desk panels, baffles, room dividers, acoustic curtains, self-adhesive panels and acoustic wallpapers. Standard colours are natural white, silver grey and anthracite; custom dyeing, embossing and cutting to size are possible. Production takes place in Austria. Tante Lotte is a certified Common Good company.

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Test report on request

Whisperwool KYTOS

Name: Whisperwool KYTOS
Brand: Whisperwool

KYTOS

WallCeiling

Description

KYTOS by Michael Stuchlik: relief of irregular, cell-like shapes. The core is made of unsorted sheep wool and is marbled.

Technical data

Material: Virgin sheep wool, recycled wool and recycled Whisperwool residues, bonded with biodegradable binding fibre; facing layer of colour-sorted sheep wool (wool felt)

Surface: 3D-embossed

Up to fire class: EN 13501-1 F

Colours: silver grey, natural white, anthracite

Measurement data

Sound absorption

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

NRC

0.90

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.60	0.80	0.90	0.85	0.95	0.95

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Compare		Value
	2 in cavity, fully damped	NRC0.90
	9.8 in cavity, undamped	NRC0.75
	2 in cavity, undamped	NRC0.75
	no cavity, mounted directly	NRC0.45

Test report: P-1430-2016/08-1

NRC: 0.90 (derived from ISO 354 lab data)

Measurement date: 2016-08-10

Measured values as a table (4 measurements)

Whisperwool KYTOS: 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
12 mm Basisplatte · no cavity, mounted directly · 3D-embossed	0.45	0.07	0.05	0.03	0.10	0.10	0.14	0.22	0.28	0.38	0.49	0.57	0.68	0.76	0.80	0.87	0.93	0.89	0.86
12 mm Basisplatte · 50 mm cavity, undamped · 3D-embossed	0.75	0.15	0.15	0.20	0.23	0.51	0.59	0.70	0.77	0.79	0.83	0.86	0.88	0.85	0.85	0.86	0.86	0.83	0.83
12 mm Basisplatte · 50 mm cavity, fully damped · 3D-embossed	0.90	0.60	0.66	0.53	0.72	0.87	0.87	0.88	0.95	0.91	0.88	0.86	0.88	0.90	0.92	0.96	0.97	0.94	0.88
12 mm Basisplatte · 250 mm cavity, undamped · 3D-embossed	0.75	0.64	0.49	0.58	0.67	0.67	0.69	0.79	0.75	0.71	0.69	0.75	0.79	0.85	0.86	0.89	0.89	0.90	0.84

Measured values as a table (4 measurements)

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Last updated: 09/13/2026