Kerakoll Biofix Grey High-Performance Mineral Tile Adhesive – 20 kg

Kerakoll Biofix Grey is a high-performance, eco-friendly mineral tile adhesive engineered for the secure, long-lasting installation of ceramic tiles, porcelain vitrified tiles, and natural stone. Formulated under strict green-building standards, this cementitious adhesive features an exceptionally low content of chemical additives and active organic salts, creating a structural bond that will not degrade over time.

Its extra-pure inert mineral matrix ensures a smooth, buttery consistency that spreads effortlessly. Engineered with advanced no-vertical-slip mechanics and an extended open working window, Biofix Grey is the trusted professional grade for internal walls and floors across residential and commercial spaces.

Key Features & Benefits

• Class C2TE Performance: Formulated with high-strength cementitious binders to deliver superior tensile bond strength and heavy-duty holding power.

• No Vertical Slip (T): High thixotropic properties provide excellent initial grab, holding vertical wall tiles and large-format kitchen backsplashes firmly in place without sagging.

• Extended Open Adjusting Time (E): Features an optimized working window ($\ge$ 30 minutes) that prevents premature skinning, allowing installers plenty of time to precisely position and align layouts.

• Eco-Friendly & Low VOC: Developed with active natural minerals to achieve exceptionally low volatile organic compound (VOC) emissions, contributing to safe indoor air quality.

• Thick Bed Optimization: Capable of handling an adhesive bed thickness up to 15 mm, making it easy to iron out minor substrate irregularities or variations during application.

• Cost-Effective Efficiency: Delivers the exact same high structural strength as Biofix White, offering an economical choice for non-translucent porcelain, vitrified tiles, and dark natural stones.

Specifications

• Brand: Kerakoll

• Product Line: Biofix (Grey)

• Packaging Size: 20 kg Bag

• Adhesive Classification: Class C2TE (High-Performance, Slip-Resistant Cementitious Adhesive)

• Maximum Application Thickness: From 3 mm up to 15 mm

• Water Mixing Ratio: $\approx$ 5.5 to 6.0 Litres of clean water per 20 kg bag

• Coverage/Yield: $\approx$ 3 to 5 kg/$m^2$ depending on substrate smoothness and notched trowel selection

• Ideal Substrates: Cement screeds, concrete blocks, brick walls, cement plasters, and internal tile-on-tile overlays.

• Optimal Environments: Domestic and commercial interiors, including bathrooms, living rooms, corridors, and kitchen floors.

How to Use for Best Results

1. Substrate Preparation: Ensure the installation surface is fully cured, compact, compact, and completely free of dust, oils, grease, loose particles, or residual paint laitance.

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

3. Application Technique: Apply a thin flat scrape-coat to the substrate with the flat edge of a trowel to key the adhesive into the surface, then comb immediately with an appropriately sized notched trowel.

4. Tile Embedding: Press each tile firmly into the wet mortar ridges using a slight twisting motion to achieve absolute transfer. For heavy vitrified tiles or high-traffic floor areas, use the back-buttering technique to eliminate hollow air pockets under the tiles.

Note: Because this product has a dark 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 Biofix White for those delicate materials.