Kerakoll Bioflex Grey Flexible Mineral Tile & Stone Adhesive – 20 kg

Kerakoll Bioflex Grey is an eco-friendly, highly polymer-modified flexible mineral adhesive engineered for high-strength setting of vitrified tiles, porcelain slabs, and non-sensitive natural stone. Formulated with low-carbon cementitious binders and active regional minerals, this professional adhesive creates a structural bond that withstands heavy traffic, environmental stress, and shear forces.

Its non-sag rheology and water-resistant formulation make it highly dependable for both interior and exterior architectural projects—offering world-class durability from internal living zones to exposed outdoor balconies, terraces, and water bodies.

Key Features & Benefits

• Highly Polymer-Modified: Provides exceptional tensile and compressive bond strength, absorbing structural stress and thermal variations.

• Thick Bed Application: Easily adjusts to accommodate adhesive bed thicknesses up to 15 mm, simplifying installation on uneven substrates.

• No-Sag Thixotropic Properties: Delivers strong initial grab and excellent vertical slip resistance, keeping large-format wall tiles precisely in place without sliding.

• Extended Workability: Offers a prolonged 30-minute open time and long pot life, allowing installation teams to position and align complex layouts comfortably.

• Weather & Heat-Age Resistant: Maintains exceptional structural bond strength under intense heat and moisture, making it ideal for terraces, balconies, fountains, and swimming pools.

• Cost-Effective Efficiency: Offers identical polymer-modified strength and flexibility as Bioflex White, providing a budget-friendly option for non-translucent tiles.

Specifications

• Brand: Kerakoll

• Product Line: Bioflex (Grey)

• Packaging Size: 20 kg Bag

• Adhesive Category: Polymer-Modified Cementitious Mineral Adhesive

• Maximum Bed Thickness: Up to 15 mm

• Water Mixing Ratio: $\approx$ 5.0 to 5.5 Litres of clean water per 20 kg bag

• Coverage/Yield: $\approx$ 1.2 to 1.4 kg/$m^2$ per mm of bed depth (covers roughly 50–55 sq. ft. per bag under standard application parameters)

• Optimal Environments: Internal and external walls and floors, domestic and commercial properties, balconies, terraces, swimming pools, and fountains.

How to Use for Best Results

1. Substrate Preparation: Substrates must be fully cured, compact, compact, rigid, and completely free of dust, oils, old adhesives, laitance, or loose particles.

2. Mixing: Pour the required clean water into a mixing bucket and slowly stir in the Bioflex Grey powder. Mix continuously with a low-speed mechanical stirrer ($\approx$ 400 rpm) until a smooth, lump-free paste is achieved. Allow the mixture to slake for 3 to 5 minutes, then stir briefly again before application.

3. Application Technique: Comb the mixed mortar onto the substrate utilizing an appropriately sized notched trowel. Apply only a workable area that can be comfortably tiled within the adhesive's active open window.

4. Tile Embedding: Press the tile firmly into the wet mortar ridges using a slight twisting motion, tapping down with a rubber mallet to guarantee absolute transfer. For heavy vitrified slabs or external zones, the double-spreading (back-buttering) method is highly recommended to eliminate hollow air voids underneath.

Note: Because this product has a grey cement base, it is not recommended for translucent glass mosaics, light-colored translucent marbles, or white natural stones where color bleed-through or shading might be visible. Use Bioflex White for those delicate materials.