Acospray DC3 - Acosorb Acoustics

The highest absorption in the range and the only finish that reaches ISO 11654 Class A.

Specs

• Grain: Medium-fine spray structure
• Build: 10–42 mm
  αw 0.45 at 10 mm rising to 1.00 at 35 mm
• Absorption: NRC 0.95 at 35 mm — αw 1.00, ISO 11654 Class A
• Coverage: 1.3–1.8 kg/m² per 10 mm
• Colour: Eight standard colours. Custom colour by pigmenting the binder — a Nebius ceiling was matched to Farrow & Ball No. 70.
• Fire — Australia: Group 1 to AS 5637.1
  AWTA 25-004810 · tested on Acospray DC, grey, approx. 30 mm on 12 mm fibre cement
• Fire — Europe: B-s1,d0
  EN 13501-1 · Efectis · borate-free B-s2,d0 on request
• Substrate: Clean, dry and airtight, primed with Acoprimer. Above 15 °C during application and while it cures.
• Warranty: 5 years performance and adhesion (manufacturer) · 10-year workmanship (McPherson Coatings)

Worth Knowing:

• The only finish in the range that reaches ISO 11654 Class A.
• Grain holds shadow under grazing light.
• Produced in Green Line, the 100% post-consumer feedstock.
• Oman Grey is excluded from the Cradle to Cradle certificate only. Its recycled content is unaffected — it is named in the manufacturer’s 100% recycled declaration like every other colour.

Features

• 0.95 NRC at 35 mm
• Class A ISO 11654 · αw 1.00
• 10–50 mm applied build range
• 100% recycled cellulose fibre

When to Specify it

Specify it when the room is hard, the volume is large, or the ceiling is meant to be seen.

• Atria, foyers and public halls
• Retail and showroom volumes
• Museums and galleries
• Vaults, domes and exposed services — it takes the geometry directly
• Any room where the acoustic target needs Class A

Performance by Thickness

Absorption is a function of thickness.

Specify the thickness against the target, not the headline figure. Sound absorption coefficient by octave band, manufacturer-published.

Applied thickness: 10 mm
125 Hz: 0.12
250 Hz: 0.19
500 Hz: 0.44
1 kHz: 0.80
2 kHz: 0.81
4 kHz: 0.99
NRC: 0.55
$\alpha_w$: 0.45
ISO 11654: Class D

Applied thickness: 15 mm
125 Hz: 0.14
250 Hz: 0.26
500 Hz: 0.64
1 kHz: 0.95
2 kHz: 0.95
4 kHz: 1.04
NRC: 0.70
$\alpha_w$: 0.55
ISO 11654: Class D

Applied thickness: 20 mm
125 Hz: 0.19
250 Hz: 0.32
500 Hz: 0.77
1 kHz: 1.03
2 kHz: 1.00
4 kHz: 1.02
NRC: 0.75
$\alpha_w$: 0.60
ISO 11654: Class C

Applied thickness: 25 mm
125 Hz: 0.23
250 Hz: 0.49
500 Hz: 0.92
1 kHz: 1.06
2 kHz: 1.02
4 kHz: 1.01
NRC: 0.85
$\alpha_w$: 0.75
ISO 11654: Class C

Applied thickness: 35 mm
125 Hz: 0.32
250 Hz: 0.73
500 Hz: 0.97
1 kHz: 1.02
2 kHz: 1.00
4 kHz: 0.94
NRC: 0.95
$\alpha_w$: 1.00
ISO 11654: Class A