Manufacturer

of-stone

of-stone is the surface brand of dubbel design GmbH in Kirchlengern, North Rhine-Westphalia. The rollable mineral real-stone surfaces consist of 95 % natural mineral material from the limestone and marble family and are hand-made in Germany, every roll a one-off. With of-stone.AKUSTIC the manufacturer carries the principle over into room acoustics: a densely perforated stone surface only approx. 1 mm thick that is worked like wallpaper and allows acoustically effective build-ups with a visible stone finish.

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Datasheet

of-stone.AKUSTIC Mineral Acoustic Surface

Name: of-stone.AKUSTIC Mineral Acoustic Surface
Brand: of-stone

of-stone.AKUSTIC

WallCeiling

Description

of-stone.AKUSTIC is a rollable mineral real-stone surface with dense perforation: approx. 1 mm thick, 95 % natural mineral material from the limestone and marble family on a fabric core, approx. 1 kg/m². The rolls (2800 × approx. 980 mm) can be cut with a utility knife, bonded to almost any substructure with standard adhesive systems, or applied directly like wallpaper, including over curves and tight radii. Available in five colour shades from light to dark; every roll is a hand-made one-off. Acoustically, the perforation makes the stone permeable: in the impedance-tube test series by Fuchs Raumingenieure (DIN EN ISO 10534-2) the absorption of a 50 mm Basotect backing with the of-stone coating applied is retained almost in full. This allows highly absorbent build-ups with an unbroken stone appearance, for example in combination with an acoustic fleece. For full-surface wall mounting without an absorber backing, the manufacturer states frequency-dependent absorption values in the datasheet.

Technical data

Material: Mineral material from the limestone and marble family (95 % natural content) with a fabric core, densely perforated

Surface: Exposed real-stone surface, hand-made, every roll a one-off

Application: Acoustically effective wall and ceiling surface; full effect in combination with an additional acoustic fleece or porous absorber as backing

Colours: 5 colour shades from light to dark (F10, F40, F80, F100, FS)

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354) & impedance tube (ASTM E1050 / ISO 10534)· 2 variants

NRC

0.75

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.15	0.35	0.80	0.95	0.95	0.90

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Compare			Value
	approx. 0 in on 2 in absorber backing	0 in (applied directly)	NRC0.75
	approx. 0 in	0 in (bonded over the full surface)	NRC0.35

NRC: 0.75 (derived from ISO 354 lab data)

Institute: Acoustics laboratory of Fuchs Raumingenieure, Tillystraße 2, 90431 Nuremberg

Measurement date: 2026-05-04

Absorber: Basotect 2 in

Measured values as a table (2 measurements)

of-stone.AKUSTIC Mineral Acoustic Surface: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	50 Hz	63 Hz	80 Hz	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
approx. 1 mm on 50 mm absorber backing · 0 mm (applied directly) · Basotect 50 mm	0.75	0.06	0.05	0.07	0.06	0.17	0.16	0.20	0.34	0.55	0.69	0.82	0.90	0.93	0.94	0.95	0.96	0.95	0.90	0.92	0.93	0.85

Measured values as a table (2 measurements)

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Last updated: 09/10/2026