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 DC2 1.0

Name: Acospray DC2 1.0
Brand: Acosorb

WallCeiling

Description

Acospray DC2 1.0 is a sound-absorbing spray plaster with a fine spray texture, made of recycled, enriched cellulose fibres and a binder. It is applied at 5 to 45 mm; from 25 mm it already reaches maximum absorption in the speech-frequency range. Absorption rises with layer thickness up to αw 0.90 (42 mm). Open to diffusion and hygroscopic, down to swimming pools and semi-outdoor areas. Weight around 1.5–2.0 kg/m² per 10 mm. Also available as a Green Line recyclate version (India Yellow, Hong Kong Grey).

Technical data

Material: Acoustic spray plaster of recycled, enriched cellulose fibres and a binder

Surface: fine spray 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

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, cool grey, ILA (concrete) grey, oman grey, black; Green Line recyclate: India Yellow, Hong Kong Grey

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 4 variants

NRC

0.85

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.25	0.65	0.85	0.95	1.00	1.00

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Compare		Value
	1.7 in	NRC0.85
	1.3 in	NRC0.80
	0.6 in	NRC0.75
	0.2 in	NRC0.50

Test report: TNO 2012 R10881

NRC: 0.85 (derived from ISO 354 lab data)

Institute: TNO

Measurement date: 2012-08-01

Room volume: 7,063 cu ft

Object area: 113 sq ft

Distance: Direct (no gap)

Measured values as a table (4 measurements)

Acospray DC2 1.0: sound absorption coefficient αs per ISO 354 by frequency and test build-up
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
5 mm · Direct (no gap)	0.50	–	0.11	–	–	0.17	–	–	0.39	–	–	0.69	–	–	0.67	–	–	0.82	–
15 mm · Direct (no gap)	0.75	0.06	0.14	0.19	0.25	0.33	0.43	0.62	0.78	0.92	1.01	0.96	1.05	0.99	0.97	1.02	1.01	0.99	1.06
32 mm · Direct (no gap)	0.80	0.19	0.22	0.31	0.41	0.58	0.78	0.81	0.83	0.82	0.90	0.92	0.90	0.95	0.96	1.00	0.99	0.94	0.97
42 mm · Direct (no gap)	0.85	0.24	0.23	0.35	0.57	0.68	0.77	0.79	0.83	0.90	0.95	0.93	0.94	1.00	0.98	1.01	1.01	1.04	1.04

Measured values as a table (4 measurements)

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Last updated: 09/11/2026