Product Details
ARDEX A 828
Filling Compound and Smoothing Plaster
- Ideal for smoothing and plastering a variety of surfaces, such as - render, concrete, aerated concrete, plasterboard and construction boards
- Can be applied from a zero thickness
- Can fill large surface depressions in walls and ceilings
- Fast curing, an receiving paint in as little as 1-2 hours
- Very easy to sandSlump, tension and crack free
- Very easy to sand
ARDEX A 828: High-Performance Satin and Filling Plaster
ARDEX A 828 is a high-performance satin and filling plaster for indoor walls and ceilings. It provides a smooth, satin-like finish, can be applied from zero thickness, and is ideal for filling joints, holes, and voids. This easy-to-apply, fast-drying plaster offers excellent adhesion, low shrinkage, and is suitable for painting and wallpapering once dry. It is a breathable product, making it perfect for decorative finishes, and ensures high compressive and flexural strength.
Description
White powder based on gypsum and plastic.
When mixed with water, it forms a smooth, paste-like levelling compound which, after hardening, adheres firmly to all nonslip wall and ceiling areas, regardless of whether these are masonry, concrete, aerated concrete, lime, gypsum or cement plaster or building boards.
ARDEX A 828 can also be used as a high build plaster for filling and repairs. With its slump-free properties ARDEX A 828 can be easily and swiftly applied in a single operation, even at thicker applications.
ARDEX A 828 is permeable to diffusion and is a suitable substrate for paints, wallpapers and decorative techniques.
Use
Indoors; on walls and ceilings.
ARDEX A 828 can be used on plasterboard, pre-rendered walls, suitable concrete backgrounds, aerated concrete, lightweight blocks, construction boards, over old and sound decorative finishes. ARDEX A 828 can also be used:
- As a lightweight adhesive for lightweight blocks (non-structural use)
- For filling large static cracks and deep holes
- For making good and filling electrical wall chases
- Can facilitate ‘dot and dab’ plaster board to walls
- For smoothing and plastering raw masonry, concrete, aerated concrete, lightweight building boards, softboards and insulation boards
- To fill joints in gypsum plasterboards and other building boards
- To fill and smooth joints in prefabricated concrete ceilings
- For laying gypsum planks
- For dowelling and positioning of raw plugs for non-structural fittings and fixtures
The extra fine formulation can help to achieve a feather edge, ideal for achieving a high quality, smooth finish. It is tension free with a non-shrink formulation and even at very thin bed depths, the product creates a hard, crack free sound surface which is not affected by wallpaper adhesives, water or solvent based paints.
Considerations
ARDEX A 828 Wall and surface filling compound should be applied at temperatures above +5°C. Low temperatures prolong the working time; high temperatures shorten it. The mortar must be protected against frost during setting. Antifreeze or any similar concrete admixtures must not be added to the mortar under any circumstances.
Direct exposure to wind and sunlight may adversely affect the product’s performance; therefore, the product should be protected from these effects during application and drying.
By forming 45° chamfers on gypsum board joint edges, ARDEX A 828 can be used as a tape-free joint filler.
For sanding the surface of ARDEX A 828, we recommend abrasives with a grain size of 180-240 from MIRKA and FESTOOL.
In case of doubt, create test areas.
Packaging
25 kg kraft bag
5 kg kraft bag
Shelf Life and Storage
Can be stored for approximately 12 months in its original unopened packaging in dry and cool conditions.
Mixing Ratio
15 liters of water per 25 kg bag.
Dry Powder Density
Approximately 1.0 kg/l
Wet Mortar Density
Approximately 1.5 kg/l
Material Requirement
Approximately 1.0 kg powder/m²-mm
Requirements by Quality Class:
- Q1 quality class ~ 0.3 kg/m²
- Q2 over Q1 ~ 0.1 kg/m²
- Q3 over Q2 ~ 0.2 kg/m²
- Q4 each 1 mm thickness ~ 1.0 kg/m²
Working Time (+20°C)
Approximately 30 minutes
Drying time (+20°C)
approx. 1 hour for 1-2 mm,
approx. 6 hours for 10 mm
Painting and Adhesive Work
After drying
Compressive Strength
Approximately 9 N/mm² after 28 days
Flexural Strength
Approximately 4 N/mm² after 28 days
pH Value
Approximately 8
GISCODE
CP1 – Calcium sulfate-based filler mortar, unclassified
EMICODE
EC 1PLUS – Very low emission
GHS/CLP Classification
None
GGVSEV/ADR Classification
None
IMPORTANT NOTE
This Frequently Asked Questions (FAQ) section is prepared for general information purposes and does not constitute a definitive guide. For the most accurate and up-to-date information please refer to the product technical data sheets. For detailed information about product features, usage conditions, and application methods, we recommend consulting the ARDEX Turkey technical team. Before any application, obtaining expert advice on surface preparation and product selection will increase the success of the application.
How can I achieve a smooth, satin-like finish on walls and ceilings?
ARDEX A 828 is a high-performance satin and filling plaster that provides a smooth, satin-like finish. It can be applied from zero thickness and is ideal for filling joints, holes, and voids.
What are the suitable applications for ARDEX A 828?
ARDEX A 828 is used for indoor walls and ceilings, filling joints and voids in gypsum boards, concrete, and aerated concrete elements. It is also used for securing fixtures and creating satin surfaces on gypsum board.
How do I mix and apply ARDEX A 828 for optimal results?
Mix 25 kg of ARDEX A 828 powder with approximately 13 liters of water to form a creamy paste. Apply the mixture with ease; it does not sag or crack during drying.
What are the benefits of using ARDEX A 828?
ARDEX A 828 offers excellent adhesion, low shrinkage, high filling strength, and is breathable, making it an excellent substrate for paint, wallpaper, and decorative coverings.
What is the shelf life and storage condition for ARDEX A 828?
ARDEX A 828 can be stored for approximately 12 months in its original unopened packaging, in dry and cool conditions.
How can I prevent sagging and cracking in plaster applications?
Using a high-quality satin and filling plaster like ARDEX A 828 ensures that the plaster does not sag or crack during drying, providing a durable and smooth finish.
What is the best plaster for filling joints and voids in gypsum boards?
ARDEX A 828 is ideal for filling joints, holes, and voids in gypsum boards, offering a smooth, satin-like finish and excellent adhesion to various substrates.
How do I prepare a surface for painting and wallpapering?
Apply ARDEX A 828 as a breathable plaster that provides an excellent substrate for paint, wallpaper, and decorative wall coverings, ensuring a smooth and even surface.
Do you have any questions about this product?
You can ask your questions about this product by filling out our contact form.