Product Details
ARDEX JK
Fast-Drying Thin Joint Grout
- Cement-based, available in gray and white
- For ceramic tiles and natural stones
- Suitable for swimming pools
- For joint widths of 1 - 8 mm
- Walkable after 90 minutes


Fast-Drying Thin Joint Grout for 1-8 mm Joints – ARDEX JK
ARDEX JK Fast-Drying Thin Joint Grout provides durable and quick-drying joint filling for ceramic tiles and natural stones. Suitable for joint widths of 1 – 8 mm, it is ideal for swimming pools and areas with high moisture. Available in gray and white.
Usage Areas
For both interior and exterior applications. Suitable for walls and floors. Ideal for swimming pools, bathrooms, kitchens, and other areas with ceramic tiles and natural stones. Suitable for joint widths of 1 – 8 mm.
Product Content
Cement-based grout with special additives, with a maximum grain size of 0.25 mm. When mixed with water, it forms a soft, easy-to-apply and wipe, fast-drying, crack-resistant, and high-strength mortar.
Packaging
5 kg kraft bag
Shelf Life and Storage
Approximately 12 months in a dry and cool environment in its original unopened packaging, protected from sunlight and frost.
Mixing Ratio
4 liters of water per 20 kg of powder
Dry Powder Density
Approximately 1.3 kg/l
Wet Mortar Density
Approximately 2.1 kg/l
Material Requirement
For 3 mm joint width and 5 mm joint depth:
- For 30 x 30 cm tiles: approximately 0.20 kg/m²
- For 15 x 15 cm tiles: approximately 0.40 kg/m²
- For 10 x 10 cm tiles: approximately 0.60 kg/m²
- For 5 x 5 cm tiles: approximately 1.10 kg/m²
An additional 0.05 – 0.10 kg/m² may be needed depending on the surface texture and working method.
Working Time*
Approximately 30 minutes
Walkable Time*
Approximately 90 minutes
*These values are approximate and calculated under laboratory conditions at +20°C and 65% relative humidity. Environmental and air conditions can alter these values. Higher temperatures and lower humidity shorten these times, while lower temperatures and higher humidity extend them.
Brinell Hardness
- After 1 day: 40 N/mm²
- After 3 days: 60 N/mm²
- After 7 days: 80 N/mm²
- After 28 days: 100 N/mm²
Suitability for Underfloor Heating
Suitable
GHS/CLP Classification
GHS05, Corrosive
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.
What is ARDEX JK Fast-Drying Thin Joint Grout?
ARDEX JK Fast-Drying Thin Joint Grout is a cement-based grout designed for joints between 1 – 8 mm. It is available in gray and white, and is suitable for ceramic tiles, natural stones, and swimming pools. It is walkable after 90 minutes.
Where can ARDEX JK Fast-Drying Thin Joint Grout be used?
This grout is suitable for both interior and exterior applications, including swimming pools, bathrooms, kitchens, and other areas with ceramic tiles and natural stones. It is ideal for joint widths of 1 – 8 mm.
How does ARDEX JK Fast-Drying Thin Joint Grout improve joint filling?
It provides strong, durable joint filling that sets quickly, making it walkable after just 90 minutes. It offers high resistance to water and moisture, ensuring a long-lasting finish.
What is the mixing ratio for ARDEX JK Fast-Drying Thin Joint Grout?
For 20 kg of powder, mix with 4 liters of water.
What are the benefits of using ARDEX JK Fast-Drying Thin Joint Grout?
This grout offers high adhesion strength, quick-drying properties, and resistance to water and moisture. It is available in gray and white, making it suitable for various tile designs and applications.
How does ARDEX JK Fast-Drying Thin Joint Grout provide water repellent properties?
ARDEX JK Fast-Drying Thin Joint Grout is formulated with special additives that create a barrier against water, ensuring that the joints remain dry and protected from moisture.
How does ARDEX JK Fast-Drying Thin Joint Grout repel dirt?
The grout has a smooth, non-porous surface that prevents dirt from sticking, making it easy to clean and maintain.
What are the benefits of using a sand-free grout like ARDEX JK Fast-Drying Thin Joint Grout?
Sand-free grout provides a finer, smoother finish that is less likely to shrink or crack. It also ensures easier application and cleaning.
How does ARDEX JK Fast-Drying Thin Joint Grout resist cracking?
The flexible formulation of ARDEX JK Fast-Drying Thin Joint Grout allows it to absorb movement and stress, preventing cracks from forming in the joints.
How does ARDEX JK Fast-Drying Thin Joint Grout provide high adhesion?
The special formulation of ARDEX JK Fast-Drying Thin Joint Grout ensures strong adhesion to tile edges, creating a durable and long-lasting bond that withstands heavy traffic and environmental stress.
Do you have any questions about this product?
You can ask your questions about this product by filling out our contact form.