Whisperwool FALTER

Name: Whisperwool FALTER
Brand: Whisperwool

FALTER

α_w 0.35–0.90Absorber classes A–D

WallCeiling

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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

Description

FALTER by Michael Stuchlik folds the wool panel into a relief of triangular faces.

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: folded

Up to fire class: EN 13501-1 F

Colours: natural white, silver grey, anthracite; special colours on request

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 4 variants

α_w

0.90

Frequency values

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Compare		Value
	50 mm cavity, fully damped	α_w0.90
	250 mm cavity, undamped	α_w0.80
	50 mm cavity, undamped	α_w0.75
	no cavity, mounted directly	α_w0.35

Absorber class: A

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

Measurement date: 10/08/2016

Measured values as a table (4 measurements)

Whisperwool FALTER: 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
12 mm base panel · no cavity, mounted directly · gefaltet	0.35	D	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 base panel · 50 mm cavity, undamped · gefaltet	0.75	C	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 base panel · 50 mm cavity, fully damped · gefaltet	0.90	A	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 base panel · 250 mm cavity, undamped · gefaltet	0.80	B	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: 20/10/2026

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