Ardex A826 Plaster Ultra-Fine Finishing Single Coat 25kg
Ardex A826 Plaster Ultra-Fine Finishing Single Coat 25kg
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| Type | Plaster |
|---|---|
| Brand | Ardex |
ARDEX A 826 Ultra-Fine Finishing Plaster
Single coat ultra-fine finishing plaster for smooth, brilliant white surfaces.
ARDEX A 826 is a brilliant white, rapid hardening, ultra-fine plaster designed for the smoothing and finishing of interior walls and ceilings. It delivers a true feather finish and can be painted in as little as one hour — no sanding required. Perfect for creating ultra-smooth finishes on walls and ceilings, ARDEX A 826 is ideal for new builds, refurbishments, and high-end finishing projects where a flawless surface is essential.
Key Features & Benefits
- ✅ Ultra-fine skim coat for a flawless, smooth surface
- ✅ Single coat application – no multiple layering required
- ✅ Paint-ready in as little as 1 hour under normal conditions
- ✅ No sanding required – finish with a damp sponge for perfection
- ✅ Excellent coverage – up to 27m² at 1mm thickness
- ✅ Shrinkage compensated – won’t crack or craze
- ✅ Feather edge to 10mm in a single application
- ✅ Brilliant white finish for high-quality decorative work
- ✅ Conforms to EN 13963:2014 and rated A1 non-combustible (EN 13501-1)
Ideal Applications
ARDEX A 826 provides an exceptional background for paint or wallpaper finishes and is perfect for:
- Plasterboards and construction boards
- Pre-rendered and suitable concrete surfaces
- Aerated concrete and lightweight blockwork
- Filling joints between plasterboards and fine surface finishing
- Areas requiring ultra-smooth finishes, such as those with spotlighting or direct lighting
Mixing & Application
Gradually add 2 parts powder to 1 part clean water (approximately 16L water per 25kg bag) while mixing continuously using a drill and mixing paddle. Allow the mixture to stand for 2–3 minutes, then remix to a smooth, creamy consistency. The working time is approximately 1 hour at 20°C.
Apply ARDEX A 826 using a trowel, blade, or filling knife in a single coat. The unique hardening technology allows entire walls or ceilings to be smoothed in one pass. Finish using a damp sponge — no sanding required. Apply at temperatures above 5°C.
Drying & Finishing
- Surface dry: 1–2 hours
- Ready for paint or wallpaper: Once surface is dry
- Recommended thickness: Feather edge up to 10mm
Drying times may vary depending on layer thickness, substrate porosity, and ambient temperature. At 20°C, skim coats can be ready to paint within 1 hour.
Coverage
Approx. 27m² per 25kg bag at 1mm thickness
Technical Data
| Mixing Ratio | Approx. 16L water : 25kg powder (1 vol. water : 2 vol. powder) |
| Working Time (20°C) | Approx. 1 hour |
| Standing Time | 2–3 minutes before remixing |
| Maximum Thickness | 10mm |
| Bulk Density | Approx. 0.8kg/L |
| Mortar Weight (Fresh) | Approx. 1.5kg/L |
| Ball Pressure Hardness (28 days) | Approx. 8 N/mm² |
| Tensile Bending Strength (28 days) | Approx. 4 N/mm² |
| pH Value | Approx. 8 |
| Embodied Carbon (A1–A3) | 0.49 kg CO₂ eq/kg |
Packaging & Storage
Supplied in 25kg paper sacks with polyethylene lining. Store in original, unopened packaging in a cool, dry place, off the ground and protected from moisture. Shelf life: 12 months.
Frequently Asked Questions
What is ARDEX A 826 used for?
ARDEX A 826 is an ultra-fine finishing plaster for smoothing interior walls and ceilings. It creates a flawless, paint-ready surface ideal for premium decorative finishes.
Can ARDEX A 826 be applied directly over plasterboard?
Yes. It can be applied directly onto plasterboard, pre-rendered walls, and suitable concrete surfaces, delivering a smooth, crack-free surface.
Do I need to sand ARDEX A 826 before painting?
No. ARDEX A 826 is designed to be sponge-finished, eliminating the need for sanding. However, it can be lightly sanded if a perfectly smooth surface is desired.
How long before I can paint over ARDEX A 826?
Under typical conditions (20°C, thin coat), paint can be applied in as little as 1 hour after application.
What thickness can I apply ARDEX A 826 at?
It can be applied from a feather edge up to 10mm in a single coat without cracking or crazing.
What is the coverage of ARDEX A 826?
Approximately 27m² per 25kg bag at 1mm thickness, depending on substrate and application method.
Does ARDEX A 826 crack or shrink?
No. The formula is shrinkage-compensated, ensuring a stable, crack-free, and smooth finish even at thin layers.
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