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MAPEI Keraflex Maxi S1 white polymer modified tile adhesive 25kg bag for large format tiles
MAPEI Keraflex Maxi S1 white polymer modified tile adhesive 25kg bag for large format tiles

Mapei Keraflex Maxi S1 Tile Adhesive

C2TE S1 deformable cementitious tile adhesive for large-format porcelain, ceramic and suitable natural stone. Extended open time and reduced slip for walls and floors.

Vendor: Mapei
SKU: TILEADMAPMAXIS1/20
Availability: Out Of Stock
$50.51
$50.51
Prices do not include GST

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Description  

Mapei Keraflex Maxi S1 is a high-performance, polymer-modified cementitious tile adhesive designed for large-format ceramic and porcelain tiles and suitable natural stone. Its combination of S1 deformability, extended open time and reduced vertical slip gives tilers a practical way to position larger, heavier tiles while maintaining a reliable adhesive bed.

Large-format tiles place different demands on an adhesive: they need excellent contact beneath the tile, a bed that holds its shape and enough time to position and adjust each piece. Keraflex Maxi S1 is designed for these applications on correctly prepared walls and floors, including approved thicker-bed installations where specified. It is a tile adhesive, not a substitute for correcting an unsuitable or unstable substrate.

Where Keraflex Maxi S1 works best

  • Large-format porcelain and ceramic: Install compatible large and heavy tiles on suitably prepared internal or external walls and floors.
  • Suitable natural stone: Bond approved, moisture-stable stone finishes where a cementitious adhesive is appropriate.
  • Walls and floors requiring flexibility: S1 classification helps accommodate the movement demands of correctly designed tiled systems, including specified heated screeds.
  • Renovation tiling: Use on approved prepared substrates and compatible waterproofing systems where the relevant primer and preparation requirements are met.

What makes Maxi S1 different?

Unlike a basic cementitious tile adhesive, Keraflex Maxi S1 combines improved adhesion with deformability, extended open time and resistance to tile slip. Its C2TE S1 classification is particularly relevant when choosing an adhesive for large-format tiling. For fast-setting requirements, select a product specifically designed for rapid curing rather than assuming extended-open-time adhesive will deliver an early return to service.

Important before tiling

Check the required bed thickness, substrate condition and coverage for the tile format. Large tiles commonly need an appropriate notched trowel and back-buttering to achieve the specified contact. Choose an alternative approved system for incompatible, unstable or highly moisture-sensitive substrates. Do not confuse this product with Keraflex Maxi S1 Zero: check the supplied grade and its applicable documentation before relying on grade-specific environmental or installation claims.

Common Questions  

What classification does Keraflex Maxi S1 have?
It is classified C2TES1 under ISO 13007-1.

How thick can it be applied?
Up to 15mm where permitted by the technical data.

Can it be used over underfloor heating?
Yes. Its S1 deformability suits correctly prepared heated screeds.

Can it be used on timber?
No. Wood and wood conglomerates are excluded.

Uses & Benefits  
C2TES1 cementitious adhesive for large-format tile and moisture-stable natural stone on walls and floors. S1 deformability helps accommodate movement in heated screeds and demanding tile systems. Can be built up to 15mm thick where permitted. Open time is about 30 minutes and adjustability about 60 minutes at 23°C. Pot life is about 8 hours at 23°C.
How To Apply  
Use on fully cured, dry and clean substrates. Cementitious renders require about 1 week cure per centimetre thickness. Standard cement screeds require about 28 days unless made with a suitable rapid Mapei binder. Prime gypsum and anhydrite substrates as specified and keep residual moisture at 0.5% or below. Mix a 20kg bag with the documented water quantity, rest 5 minutes, then remix. Apply with the correct notched trowel. For outdoor work, tiles over 900cm², heavy loads or immersion, back-butter to achieve full coverage.
Limitations and Safety Info  
Do not use on wood or wood conglomerates. Do not use on metal, rubber, PVC or linoleum. Do not use with marble or natural stone subject to efflorescence, staining or moisture-induced movement. Do not use on precast concrete or substrates subject to excessive movement. Do not open tiled floors immediately to traffic. Allow about 24 hours before light foot traffic and 14 days before full service or polishing.
Suitable Substrates  
  • Cementitious screeds and renders.
  • Underfloor heating and cooling systems.
  • Firmly fixed gypsum board and prepared anhydrite screeds.
  • Existing tile, marble and terrazzo.
  • Compatible Mapelastic and Mapegum waterproofing systems.
  • Moisture-stable ceramic, porcelain and natural-stone finishes.

Mapei Keraflex Maxi S1 Tile Adhesive Physical Properties

Mapei Keraflex Maxi S1 Tile Adhesive Physical Properties
Property Value
Density 1400 kg/m³
Solid Content 100%
Consistency Pasty
Density Of The Mix 1500 kg/m³
pH Over 12
Pot Life Over 8 hours
Application Temperature +5°C to +35°C
Open Time > 30 minutes
Adjustability Time Approx. 60 minutes
Bond Strength 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)
Chemical Resistance Excellent
Service Temperature -30°C to +90°C
Deformability S1 (Deformable)
Grouting On Walls 4-8 hours
Grouting On Floors 24 hours
Ready for Light Foot Traffic 24 hours
Full Cure 14 days
VOC Content 5.4 g/l
Shelf Life 12 months

Mapei Keraflex Maxi S1 Tile Adhesive - Use Cases

Here are some common examples on where Mapei Keraflex Maxi S1 Tile Adhesive used by our customers.

Tiling

Large Format Tile Fixing

Installing large format porcelain or natural stone tiles on internal/external floors with movement potential.

Its S1 deformability tolerates substrate movement, while extended open time and non-slip properties allow precise placement of heavy tiles.

  • S1 deformable (EN 12004)
  • >30 minute open time
  • No vertical slip
  • -30°C to +90°C use

Tiling

Install Large Format Vertical Tiles

Securing heavy, large-format ceramic or stone tiles on internal or external vertical surfaces.

Its high thixotropy and no vertical slip prevent sagging, allowing efficient installation of even the largest tiles from the top down.

  • C2TE S1 compliant
  • No vertical tile slip
  • Highly thixotropic formulation
  • 60 minutes adjustability time

Tiling

Tile Over Deformable Floors

Laying ceramic or stone tiles on cementitious screeds, including underfloor heating or uneven substrates up to 15 mm.

Its S1 deformability accommodates minor substrate movement from thermal changes or traffic, while its 15 mm bed capability minimises pre-levelling.

  • S1 deformable classification
  • 2.5 N/mm² heat adhesion
  • Suitable for underfloor heating
  • Up to 15 mm bed thickness

Flooring

Floor Tiling in High-Traffic Environments

Laying ceramic or stone tiles in commercial, retail, or public spaces subject to heavy foot traffic or substantial loads.

The high initial and long-term tensile adhesion strength, combined with its robust formulation, provides a durable bond that withstands the stresses of continuous heavy traffic, preventing tile lifting or cracking.

  • Initial tensile adhesion strength (2.6 N/mm²)
  • Excellent resistance to alkalis and solvents
  • Set to light foot traffic in 24 hours

Waterproofing

Tiling Over Waterproofed Surfaces

Installing ceramic or stone tiles onto interior or exterior surfaces that have been previously waterproofed with flexible membranes.

This adhesive is specifically designed for compatibility and reliable bonding over common cementitious and liquid-applied waterproofing systems, ensuring the integrity of the tiled finish and the underlying membrane.

  • Compatible with Mapelastic AquaDefense, Mapelastic Smart, Mapegum WPS
  • S1 deformable classification

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