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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Acospray DC1
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.
ISO 354 – reverberation chamber· 2 variants
αp per ISO 11654
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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
