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.
Test report on request
Whisperwool window panel
Window panel
Description
The window panels carry a transparent Gecko adhesive layer on the back and adhere to glass-smooth surfaces without glue. They can be removed without residue and repositioned. An alternative to curtains and privacy film on glass surfaces, also as a room divider. Three shapes by Horst Philipp: APPS, MOSS and OBLONG.
Technical data
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.10 | 0.30 | 0.60 | 0.80 | 0.90 |
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Method (354): Analytically calculated
Measurement date (354): 2016-08-10
Test report: P-1430-2016/08-1
NRC: 0.45 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 · on Glas haftend, without cavity · Wollfilz | 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 |
Measured values as a table (1 measurement)
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