The range · Mineral plaster
Acoplaster F
The smoothest surface in the range, and the only one that is not sprayed in mass. A 30 mm mineral-wool panel is bonded to the substrate and finished with a 2 mm plaster coat, so it reads as flat plaster and performs as an absorber.
0.90NRC at 32 mm
Class BISO 11654 · αw 0.95
35 mm systemApplied build range
100%Recycled cellulose fibre
When to specify it
Specify it when the ceiling has to look like a plastered ceiling and nothing else.
- Boardrooms and reception where the ceiling must read as plaster
- Galleries and museums
- Heritage interiors where a sprayed texture would be wrong
- Any brief that says “flat, white, and no visible system”
Specification
| Grain | Smooth, sanded |
| Build | 35 mm system 3 mm plate adhesive + 30 mm mineral wool + 2 mm plaster |
| Absorption | NRC 0.90 at 32 mm — αw 0.95, ISO 11654 Class B |
| Coverage | 7–8 kg/m² applied |
| Colour | White. Any other colour by adding pigment to the plaster. |
| Fire — Australia | Group Number not established for this system AWTA 25-004810 covers the sprayed Acospray systems, not this one. Request a Group Number assessment where the project needs one |
| Fire — Europe | B-s2,d0 EN 13501-1 · Efectis 1350-1:2018 |
| 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:
- Substrate flatness sets the flatness of the finished plane.
- Minor repairs by hand — spread material, sand back when dry.
- Airless spray only when painting. Never rolled.
- Moisture is monitored while it dries.
Colour
White. Any other colour by adding pigment to the plaster.
Colour photography: Acosorb International.
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 | 125 Hz | 250 Hz | 500 Hz | 1 kHz | 2 kHz | 4 kHz | NRC | αw | ISO 11654 |
|---|---|---|---|---|---|---|---|---|---|
| 32 mm | 0.28 | 0.77 | 1.00 | 0.95 | 0.92 | 0.91 | 0.90 | 0.95 | Class B |
Source: Acosorb published product data; αw rated to ISO 11654. Room performance is to be confirmed by the project's acoustic consultant against AS/NZS 2107 — these are material figures, not a room result.
Also in the range