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Keraflex Maxi S1 is a deformable, high-polymer cement adhesive (ISO 13007-1 C2TE S1) engineered for modern large-format tiles. Its high thixotropy eliminates vertical slip, allowing heavy panels to be set from the top down without spacers. An extended open time (>30 min) and long adjustability (~60 min at 23 °C) give installers the working window needed for precise alignment. On floors, the formulation accommodates up to 15 mm bed thickness to correct unevenness without pre-levelling. Once cured, the system provides high tensile adhesion (initial ~2.6 N/mm²) and S1 deformability to handle thermal cycling and substrate movement, including heated screeds. Pot life exceeds 8 hours; light foot traffic is possible after ~24 hours and full service after ~14 days.
Potential Outcome: Reduced adhesion, powdery interface, debonding under load.
Adheseal Best Practice: Ensure substrates are dry (≤0.5% moisture), hard and dust-free; prime with Primer G or Mapeprim SP as specified before trowelling the adhesive.
Potential Outcome: Skinning drastically reduces open time, causing poor wetting and voids.
Adheseal Best Practice: Work in smaller areas, shade/cool surfaces, re-comb if skin forms, and use back-buttering on large tiles to ensure full coverage.
Preventing slip on heavy 1200×600 mm panels while keeping alignment true and grout joints consistent under time pressure.
Use a 10×10 mm notch on sound, plumb walls. Trowel a contact layer, then comb fresh ribs and press panels in with full back-butter to achieve >95% coverage. High thixotropy prevents creep; the extended adjustability (~60 min at 23 °C) supports fine tuning.
Stage your spread to match conditions; if a skin forms, re-comb the bed rather than misting with water to avoid anti-adhesion films.
Managing differential movement and thermal cycling without grout cracking or debonding.
Specify Keraflex Maxi S1 (S1 deformability) over compliant screeds. Commission heating per standard, then set tiles with full-bed coverage. Grout after 24 h (floors) and allow ~14 days before full service; seal movement joints with Mapesil AC.
Use perimeter and intermediate movement joints as per tile layout and traffic class; consider Kerapoxy in chemically aggressive zones.
Bonding large tiles over compliant waterproofing without shearing under load or moisture exposure.
Once the Mapelastic membrane cures, trowel Keraflex Maxi S1 with an appropriate notch and back-butter profiled backs. For pools/basins and heavy-duty areas, ensure complete coverage and observe curing windows before immersion or service.
Use a larger notch and directional trowelling to collapse ribs; periodically lift a tile to verify coverage.
Yes, Keraflex Maxi S1 is designed for this. Its highly thixotropic nature ensures no vertical slip, allowing large and heavy tiles to be installed from the top down without support. This aligns with its C2TE S1 classification.
Yes, Keraflex Maxi S1 is rated for both interior and exterior use on floors and walls. It maintains adhesion and deformability across temperatures from -30°C to +90°C, making it suitable for floors under heavy traffic.
C2TE S1 means it's a high-performance (C2) cementitious adhesive with extended open time (E), no vertical slip (T), and S1 deformability. This provides flexibility to accommodate substrate movement, prevents tile sag on walls, and offers a longer working time of over 30 minutes, crucial for precise placement of large tiles.
Yes, gypsum substrates and anhydrite screeds must be perfectly dry and treated with Primer G or Mapeprim SP. This prepares the surface and ensures proper adhesion, preventing potential bond failure.
| Application | Key benefit | Primary trades |
|---|---|---|
| Installing large-format porcelain tiles on walls | No vertical slip (T rating) prevents heavy tiles from sagging, allowing top-down installation without pegs. | Tilers, Architects |
| Bonding ceramic or natural stone to exterior floors | S1 deformability accommodates substrate movement and temperature extremes (-30°C to +90°C), preventing cracks and delamination. | Tilers, Landscapers |
| Tiling floors subject to heavy foot traffic | High tensile adhesion strength (2.6 N/mm² initial) ensures durability and long-term bond in commercial or public spaces. | Commercial Tilers, Builders |
| Installing tiles on uneven interior substrates up to 15mm thick | Allows thick-bed application without prior levelling, saving time and materials on site prep. | Tilers, Renovation Specialists |
| Tiling over Mapei waterproofing membranes | Compatible with Mapelastic and Mapegum WPS systems, ensuring a cohesive and warrantable wet area installation. | Waterproofers, Tilers |
| Spot-bonding insulating panels (e.g., polystyrene, rock wool) | Strong adherence to various insulating materials, simplifying acoustic or thermal panel installation. | Drywallers, Insulators |
Pour powder into clean water while mixing at low speed; rest 5 min and re-mix to a smooth paste.
5.6–6.0 L water per 20 kg (28–30%).
5.4–5.8 L water per 20 kg (27–29%).
Key in a contact coat, then comb fresh ribs with a suitable notch. Back-butter large or profiled tiles to achieve ≥95% contact (wet areas/immersed) and ≥80% minimum elsewhere.
Use larger notch; up to 15 mm bed to correct minor irregularities.
Exploit high thixotropy; set from top-down without spacers, checking plumb.
Protect fresh work from rain, frost, and strong sun. Honor movement joints and seal appropriately.
Walls 4–8 h; floors ~24 h. Use Keracolor FF/GG, Ultracolor Plus, or Kerapoxy where chemical resistance is required.
Seal with Mapesil AC; consult for heavy-traffic joint design.
Keraflex Maxi S1 contains cement and free crystalline silica. Prolonged exposure to respirable crystalline silica dust can cause silicosis. Cement contact with body fluids can cause irritation or burns.
Wear close-fitting safety goggles for eye protection. Use protective gloves made of polychloroprene (CR), nitrile rubber (NBR), butyl rubber (IIR), or fluorinated rubber (FKM) with a minimum thickness of 0.35mm and breakthrough time of 480 minutes. Wear clothing that provides comprehensive skin protection, such as cotton, rubber, or PVC. Use appropriate respiratory protection where ventilation is insufficient or dust exposure levels exceed workplace limits, referencing AS/NZS 1715-1716.
Use only outdoors or in a well-ventilated area. Implement localized ventilation systems to minimise dust inhalation. Avoid breathing dust.
Store in dry conditions in original, unopened bags for up to 12 months. Keep in a well-ventilated, cool place, away from food and drink. Dispose of contents and packaging in accordance with local environmental protection and waste disposal regulations. Avoid dispersal of spilled material into drains or waterways.
Proper substrate preparation is critical for Keraflex Maxi S1 performance, ensuring optimal bond and preventing failures.
Surface prep: Substrates must be cured, mechanically sound, free of loose particles, grease, oil, paint, and wax. Cementitious screeds require at least 28 days cure, and renders 1 week per cm thickness, unless Mapei special binders were used. Keep surfaces cool if exposed to direct sunlight.
Primer: Not required for adequately cured cementitious substrates.
Surface prep: Ensure substrates are perfectly dry (max residual moisture 0.5%), hard, and dust-free. Firmly fix gypsum board. If in high moisture areas, consult Mapei Technical Services for a suitable moisture vapour barrier.
Primer: Required. Treat with Primer G or Mapeprim SP.
Surface prep: Ensure the waterproofing membrane (e.g., Mapelastic AquaDefense, Mapelastic Smart, Mapegum WPS) is fully cured and clean as per its technical data sheet.
Primer: Not required over Mapei waterproofing systems.
| Property | Value |
|---|---|
| Compliance | C2TE S1 (ISO 13007-1, EN 12004) |
| Type | Powder |
| Colour | Grey, White |
| Bulk Density | 1400 kg/m³ |
| Dry Solids Content | 100% |
| Consistency Of Mix | Pasty |
| Density Of The Mix | 1500 kg/m³ |
| pH Of Mix | Over 12 |
| Pot Life | Over 8 hours |
| Application Temperature | +5°C to +35°C |
| Open Time (EN 1346) | > 30 minutes |
| Adjustability Time | Approx. 60 minutes |
| Initial Tensile Adhesion Strength (28 days) | 2.6 N/mm² |
| Tensile Adhesion Strength After Heat Ageing | 2.5 N/mm² |
| Tensile Adhesion Strength After Water Immersion | 1.1 N/mm² |
| Tensile Adhesion Strength After Freeze/Thaw Cycles | 1.3 N/mm² |
| Resistance To Alkalis | Excellent |
| Resistance To Oils | Excellent (Poor to Vegetable Oils) |
| Resistance To Solvents | Excellent |
| Temperature When In Use | -30°C to +90°C |
| Deformability | S1 (Deformable) |
| Grouting On Walls | 4-8 hours |
| Grouting On Floors | 24 hours |
| Set To Light Foot Traffic | 24 hours |
| Ready For Use | 14 days |
| VOC Content (Rule 1168) | 5.4 g/l |
| Shelf Life | 12 months |
Here are some common examples on where Mapei Keraflex Maxi S1 used by our customers.
