FULL PALLET - 48 x 20kg - FREE ECONOMY DELIVERY (Approx. 2-3 WORKING DAYS)*

*Full pallet deals are shipped directly from Mapei. For same day despatch, orders need to be placed before 12.30pm. A tail-lift will be specified for the unloading of the pallet. Please include any important delivery instructions/access in the "Notes" when completing your order. 

Next Day Delivery is available for £42 (including VAT).

High-performance, deformable cementitious grey or ultra white adhesive, with extended open time and no vertical slip, with Low Dust technology, very low emission of volatile organic compounds and with fully offset Greenhouse Gas emissions.
Especially suitable for the installation of large-size porcelain tiles and natural stone

CLASSIFICATION ACCORDING TO EN 12004
Keraflex Maxi S1 Zero is a C2TES1 class cementitious (C), improved (2), non-slip (T), extended open time (E) deformable (S1) grey or ultra white adhesive.
Conformity of Keraflex Maxi S1 Zero is certified according to certificates TT No. 14-83310-551 (LGAI) for the grey version and n° 14-83310-550-S (LGAI) for the white one issued by the APPLUS laboratory, LGAI Technological Center Bellaterra (Spain).

WHERE TO USE

• Bonding all types and sizes of ceramic tiles (double-fired, single-fired, porcelain tiles, klinker, terracotta, etc.) on irregular internal and external substrates and render without skimming the surface prior to bonding (maximum bed depth 15mm).
• Bonding stone on internal and external surfaces (moisture stable stone, not sensitive to humidity).
• Bonding all types of mosaic on interior and exterior surfaces, also in swimming pools.

Some application examples

• Bonding ceramic tiles (double-fired, single-fired, porcelain, klinker, etc.), ceramic and glass mosaic and stone (if stable in damp environments) on the following substrates:
  "damp earth” consistency and self-levelling cementitious screeds and anhydrite screeds (after priming the surface with a suitable acrylic primer such as Primer G or Eco Prim T Plus);
• heated floors;
• sound, well cured concrete floors;
• cementitious render and lime-mortar render;
• gypsum-based render (after the application of an acrylic primer such as Primer G or Eco Prim T Plus);
• plasterboard, walls made of fibre cement panels, precast wall panels;
• waterproofing membranes made from Mapelastic Zero, Mapelastic Smart, Mapelastic Turbo, Mapelastic AquaDefense or Mapegum WPS;
• uncoupling, anti-fracture waterproofing membrane such as Mapeguard UM 35 or Mapeguard WP 200.
• Overlaying ceramic and stone on existing floors (ceramic, marble, etc.).
• Bonding floors subjected to intense traffic.
• Bonding ceramic in areas with poor ventilation close to homes where the amount of dust given off must be reduced to a minimum during mixing operations and when moving the bags.
• Bonding tiles and strips with profiled or hollow backs (porcelain tiles, klinker, single-fired, and terracotta) on internal and external surfaces.
• Installing tiles on precast concrete walls and concrete substrates (provided any release agents or sealant are mechanically removed).
• Bonding tiles in swimming pools and tanks.

TECHNICAL CHARACTERISTICS
Keraflex Maxi S1 Zero is a grey or white-coloured powder made from cement, selected graded sand, a high amount of synthetic resins and special admixtures according to a formula developed in the MAPEI research laboratories.
The environmental impacts during the entire life cycle of Keraflex Maxi S1 Zero have been assessed through the
LCA (Life Cycle Assessment) methodology and reported in EPD n° S-P-00907 for the grey version and n° S-P09631 for the white one (Environmental Product Declaration) in accordance with ISO 14025 standard, certified and published by The International EPD System.
Keraflex Maxi S1 Zero is a product with very low emission of volatile organic compounds (VOC), which safeguards the health and safety of installers and final users. It is certified as EC1 Plus by the German association GEV.
Keraflex Maxi S1 Zero helps earn important LEED credits.
The innovative Low Dust technology which characterises this adhesive considerably reduces the amount of dust given off during mixing compared with conventional MAPEI adhesives to make floor layers work easier and safer.

When mixed with water, Keraflex Maxi S1 Zero forms a mortar with the following characteristics:

• low viscosity and, therefore, good workability;
• high thixotropy; Keraflex Maxi S1 Zero may be applied on vertical surfaces without slumping and without allowing tiles to slip, even large, heavy tiles. Tiles may be bonded in place starting from the upper part of surfaces, working downwards without having to place spacers;
• adheres perfectly to all materials normally used in the building industry;
• thick layers of adhesive harden without any significant shrinkage and without reducing in thickness to form a very strong layer;
• particularly long open and adjustment times to make laying operations easier.
• adheres perfectly to all materials normally used in the building industry;
• thick layers of adhesive harden without any significant shrinkage and without reducing in thickness to form avery strong layer;
• particularly long open and adjustment times to make laying operations easier

RECOMMENDATIONS
Do not use Keraflex Maxi S1 Zero in the following cases:

• on not sufficiently cured concrete;
• on wooden conglomerates (such as chipboard, MDF etc);
• on metal, rubber, PVC, and linoleum surfaces;
• for slabs of marble and natural stone which are subject to efflorescence or staining;
• with natural stone or composite slabs subject to movements caused by dampness;
• when floors need to be put back into service quickly.
• do not add water to the mix once it starts to set.

APPLICATION PROCEDURE

Preparation of the substrate
Substrates must be cured, sufficiently dry, strong and have no crumbling areas or traces of grease, oil, varnish or wax.
Cementitious substrates must not shrink after bonding tiles. Therefore, in good weather, render must be cured for at least one week per cm of thickness and cementitious screeds must be cured for at least 28 days, unless they are made using special MAPEI screed binders such as Mapecem, Mapecem Pronto, Topcem or Topcem Pronto.
If the surface is too hot due to direct sunlight, cool it down with water. Gypsum substrates and anhydrite screeds must be perfectly dry (maximum moisture content of 0.5%w/w or
75%RH), strong and free of dust. They must also be treated with an acrylic primer such as Primer G or Eco Prim T Plus.

Preparation of the mix
Blend Keraflex Maxi S1 Zero with clean water to obtain a smooth, lump-free mix. Let the mix stand for approximately 5 minutes, then blend again.
Use approximately 5.0 - 5.4 litres of water for each 20 kg bag of powder of grey Keraflex Maxi S1 Zero and approximately 5.2 - 5.6 litres of water per 20 kg bag of white Keraflex Maxi S1 Zero. When mixed as described above, the mix lasts approximately 8 hours.

Spreading the mix
To guarantee a good bond, apply a thin layer of Keraflex Maxi S1 Zero on the substrate using the smooth side of a spreader and then immediately apply a further layer of Keraflex Maxi S1 Zero in the thickness required using a suitable spreader, depending on the type and size of the tiles being applied.
If cementitous substrates are very absorbent and in the presence of high temperatures it is advisable, before laying the mix of Keraflex Maxi S1 Zero, to moisten the substrate in order to prolong the open time of the adhesive.
In case of exterior installation, installation of large format tiles, all floor applications, application in water tanks or
swimming pools, apply the back-buttering technique by spreading the adhesive on the back of the tiles to ensure 100% coverage.

Bonding tiles
Tiles do not need to be wet before they are laid. However, if the backs of the tiles are particularly dusty, wash them by dipping them in clean water.
When applying the tiles, press down firmly using a twisting/sliding motion to guarantee complete coverage.
The open time for Keraflex Maxi S1 Zero is at least 30 minutes in normal weather and humidity conditions.
When bonding conditions are not ideal (direct sunlight, dry wind, high temperatures, etc.), or if the substrate is particularly absorbent, this time may reduce to only a few minutes.
Keep checking the adhesive to make sure skin does not form on the surface and that it is still wet. If the adhesive is no longer wet, run the notched trowel over the adhesive again to re-activate open time, or, if the adhesive has already start to set, remove it and spread a new layer of fresh adhesive. Do not wet the surface of the adhesive if skin forms. Water does not dissolve the skin and creates instead a film that impedes a good bond. Final adjustment of the tiles must be carried out within 45 minutes of bonding.

Floor and wall coverings bonded with Keraflex Maxi S1 Zero must be protected from water and rain for at least 24 hours and from freezing weather and direct sunlight for at least 5 to 7 days.
While laying tiles, it is recommended to use levelling systems of MapeLevel line to maintain the correct size of grouts and reduce height unevenness between tiles.

GROUTING AND SEALING
Tile joints may be grouted after 4 to 8 hours on walls and after 24 hours on floors. Use a MAPEI cementitious or epoxy grout, available in a wide variety of colours.
Seal expansion joints using a special MAPEI sealant.
If necessary, clean, maintain and protect the surfaces with the products from the UltraCare range.

SET TO LIGHT FOOT TRAFFIC
Floors set to foot traffic after approximately 24 hours.

READY FOR USE
Surfaces may be put into service after 14 days. Basins and swimming pools may be filled up 21 days after the
application of Keraflex Maxi S1 Zero.