Kerakoll Bioflex S1 White Highly Flexible Polymer-Modified Tile Adhesive – 20 kg

Kerakoll Bioflex S1 White is a high-performance, eco-friendly deformable mineral adhesive engineered for high-strength fixing of porcelain tiles, vitrified panels, marbles, and natural stones. Certified as a Class C2TE S1 adhesive, its advanced polymer-modified structure provides excellent flexibility and crack-bridging capabilities.

By utilizing pure regional minerals and low-carbon materials, Bioflex S1 White easily absorbs structural shifts, shear stresses, and thermal expansion. It is the ultimate choice for challenging architectural demands, including large-format tile layouts, external facades, and installations over subfloors subject to temperature fluctuations.

Key Features & Benefits

• S1 Deformable Flexibility: High elastic properties easily accommodate subfloor vibrations, contraction, and expansion forces without bond failure.

• High-Purity White Formula: Designed to eliminate ghosting, dark shadows, or staining behind translucent glass mosaics, quartz-stones, and light-colored marbles.

• Extended Open Time & No Vertical Slip (T): Gives installers an optimized open working window ($\ge$ 30 minutes) to adjust massive slabs precisely without worrying about vertical sag on walls.

• Universal Application Medium: Bonds seamlessly with standard cement screeds, concrete blocks, old tile-on-tile floors, gypsum boards, and timber substrates.

• Eco-Friendly Formulation: Developed with naturally occurring active minerals to achieve exceptionally low volatile organic compound (VOC) emissions, contributing to safer indoor air quality.

Specifications

• Brand: Kerakoll

• Product Line: Bioflex S1 (White)

• Packaging Size: 20 kg Bag

• Adhesive Classification: Class C2TE S1 (Deformable Cementitious Adhesive)

• Maximum Bed Thickness: Up to 15 mm

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

• Coverage/Yield: $\approx$ 1.2 to 1.5 kg/$m^2$ per mm of bed depth (covers roughly 45–55 sq. ft. per bag using standard notched trowels)

• Optimal Environments: Internal and external walls and floors, balconies, swimming pools, high-traffic commercial zones, and radiant underfloor heating overlays.

How to Use for Best Results

1. Substrate Preparation: Substrates must be compact, fully cured, completely structural sound, and clear of oil, old adhesive residues, laitance, or loose particles.

2. Mixing: Pour clean water into a mixing bucket and slowly stir in the Bioflex S1 White powder. Mix continuously with a low-speed mechanical mixer ($\approx$ 400 rpm) until a homogeneous, lump-free paste is achieved. Let the mix rest for 3 to 5 minutes, then stir briefly again.

3. Application Technique: Comb the mixed paste onto the substrate surface utilizing an appropriately sized notched trowel. Apply only enough material that can be comfortably tiled within the adhesive's active open time window.

4. Tile Embedding: Press the tile firmly into the wet mortar ridges using a slight twisting motion, or tap down with a rubber mallet to guarantee absolute transfer. For large format stoneware panels (larger than 60x60 cm), the double-spreading (back-buttering) method is highly recommended to eliminate hollow air voids underneath.