Manufacturer

Acosorb

Acosorb (Acosorb GmbH, Bocholt) develops and applies seamless acoustic spray and trowel plasters (acoustic plaster). The jointless wall and ceiling surfaces absorb sound and reduce reverberation while staying visually closed, with no visible joints, grids or cassettes. The spray plasters (Acospray range) are made of enriched, partly recycled cellulose fibres with a water-based binder and are applied in several cross-sprayed layers; Acoplaster F combines a non-combustible mineral-wool board with an acoustic-plaster top layer. Depending on layer thickness and build-up, absorption reaches up to the highest absorption class A. The materials are open to diffusion and hygroscopic (usable down to swimming pools and semi-outdoor areas), Cradle to Cradle Bronze certified and documented via an ISO 14025 EPD (MRPI) and Fraunhofer VOC verifications. Member of the DGNB. Reference projects in Germany and the Netherlands.

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Datasheet

Acospray DC1

Name: Acospray DC1
Brand: Acosorb

WallCeiling

Description

Acospray DC1 is a sound-absorbing spray plaster with a smooth finish and a very fine texture. Its acoustic effect comes from a blend of cellulose fibres with polymers and a water-based binder; it is applied at 5 to 20 mm. Sprayed directly (20 mm) DC1 works broadband in the mid and high range (αw 0.60). Applied onto a 30 mm mineral-wool board (35 mm build-up) it reaches the highest absorption class A (αw 1.00). Open to diffusion and hygroscopic, down to swimming pools and semi-outdoor areas. Weight around 2–3 kg/m² per 10 mm.

Technical data

Material: Acoustic spray plaster of cellulose fibres, polymers and a water-based binder

Surface: smooth finish, very fine texture; open to diffusion

Up to fire class: Low flammability (B-s1,d0) per DIN EN 13501-1 — Efectis 1350-1:2018; borate-free version B-s2,d0

Application: seamless wall and ceiling surfaces; also swimming pools and semi-outdoor areas (e.g. balconies)

Certifications: Cradle to Cradle Bronze; ISO 14025 EPD (MRPI); VOC Fraunhofer DIN EN 16516; microbially resistant (Intertek ASTM C1338-19); fire class B-s1,d0 (Efectis); no continuous smouldering (Kiwa EN 16733)

Colours: white and any specified colour (pigmented in the binder)

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 2 variants

αw

1.00

Frequency values

αp per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
αp	0.25	0.80	1.00	1.00	1.00	0.95

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Compare			Value
	35 mm (Aufbau)	30 mm mineral wool + 5 mm Spray	αw1.00
	20 mm	Direct (no gap)	αw0.60

Absorber class: A

NRC: 0.95