LANKO® Imperflex - Waterproof C2TE Cementitious Adhesive for Swimming Pools and Wet Areas
LANKO® Imperflex: waterproof, flexible cementitious adhesive for ceramic tiles
LANKO® Imperflex is an improved cementitious adhesive, class C2TE according to EN 12004, designed for fixing ceramic tiles wherever water is involved: swimming pools, showers, industrial kitchens and terraces. It achieves a tensile adhesion strength ≥ 1 N/mm² even after water immersion, heat ageing and freeze-thaw cycles, which are precisely the conditions that cause a conventional adhesive to fail.
Its formulation of white cement with selected aggregates, redispersible polymers and additives gives it a vertical slip ≤ 0.5 mm and an extended open time of about 30 minutes, so a large surface can be spread without worrying about the paste skinning over before the tiles are set.
✅ Main advantages
Waterproof and water-resistant: maintains ≥ 1 N/mm² of adhesion after immersion, suitable for swimming pool basins and permanently wet areas.
Deformable on site: absorbs small movements of the substrate without cracking the ceramic finish.
Reduced slip (≤ 0.5 mm): tiles do not slide down when fixed vertically.
Extended open time (class E): ~30 minutes at +20 °C so you can work without pressure.
White colour: does not stain light-coloured joints or show through glass mosaic or glass paste tiles.
Multi-substrate: concrete, mortar, brick, plaster, plasterboard and fibre cement.
🏗️ Recommended applications
Lining of swimming pool basins with gresite, glass mosaic and glass paste tiles.
Showers, bathrooms, changing rooms and industrial kitchens.
Porcelain stoneware floors and walls, indoors and outdoors.
Terraces and balconies exposed to freeze-thaw cycles.
Renovations over existing cementitious substrates.
📋 Technical specifications
Chemical base: polymer-modified cementitious mortar
Classification: C2TE according to EN 12004
Colour: white powder
Mixing water: 7.25 - 7.75 l per 25 kg bag
Open time: ~30 minutes at +20 °C
Adjustment time: ~45 minutes at +20 °C
Slip: ≤ 0.5 mm · EN 1308
Tensile adhesion strength: ≥ 1 N/mm² initial · ≥ 1 N/mm² after water immersion · ≥ 1 N/mm² after heat ageing · ≥ 1 N/mm² after freeze-thaw cycles · EN 1348
Application temperature: +5 °C to +35 °C (substrate and ambient)
Consumption: ~3 kg/m² with a 6x6 mm trowel
Shelf life: 12 months from the date of manufacture, in the original closed packaging and protected from moisture
Check that the substrate is sound, clean, free of dust, laitance and traces of release agent, and sufficiently flat.
Pour 7.25 - 7.75 litres of clean water into a bucket and add the 25 kg bag of LANKO® Imperflex, stirring with a low-speed mixer until you obtain a smooth, lump-free paste.
Let the mix rest for a few minutes and briefly mix again before use.
Spread a thin levelling coat with the smooth side of the trowel, then comb with the notched trowel (6x6 mm for a consumption of ~3 kg/m²).
Place the tiles within the open time (~30 min) and tap them with a rubber mallet until the adhesive transfers to the back; in swimming pools and outdoors, apply back-buttering (double-sided bonding).
Correct the position within the ~45 minutes of adjustment time and clean the joints before the adhesive hardens.
Clean tools with water while the product is still fresh; once set, it can only be removed mechanically.
🛡️ Standards and certificates
EN 12004 - Adhesives for ceramic tiles: class C2TE (improved cementitious, reduced slip, extended open time).
EN 1348 - Determination of tensile adhesion strength.
EN 1308 - Determination of slip.
CE marking and Declaration of Performance available from Sika España.
📦 Supply formats
25 kg bag · white powder
💡 Professional tip: in a swimming pool basin the adhesive alone is not enough: wait at least 21-28 days for the lining mortar to cure and always apply back-buttering (notched trowel on the substrate and a thin layer on the back of the tile). If you leave voids under the gresite, water gets in through the joint, builds up and ends up pushing the tiles off through pressure, no matter how good a C2 adhesive it is. And do not mix more product than you can place in 30 minutes: adding water to a paste that has already started to set ruins the adhesion.
Technical data according to the LANKO® Imperflex Product Data Sheet from Sika España (version 02.01, April 2024).
Frequently asked questions
Is LANKO® Imperflex suitable for swimming pools?
Yes. It is designed for fixing ceramic tiles where water is present, such as swimming pools, showers and industrial kitchens, and it maintains a tensile adhesion strength of at least 1 N/mm² after water immersion. In swimming pools, back-buttering is applied.
What classification does LANKO® Imperflex have?
It is an improved cementitious adhesive of class C2TE according to EN 12004, with a maximum slip of 0.5 mm and an extended open time of about 30 minutes at +20 °C.
On which substrates can LANKO® Imperflex be applied?
The data sheet lists concrete, mortar, brick, plaster, plasterboard and fibre cement. It is applied between +5 °C and +35 °C, with a consumption of about 3 kg/m² using a 6x6 mm trowel.
What colour and format does LANKO® Imperflex come in?
It comes as a white powder in 25 kg bags, which are mixed with 7.25 to 7.75 litres of water. Thanks to its white colour, it is a good choice for glass mosaic or glass paste tiles.
Frequently asked questions about Sika products (mortars, adhesives and sealants)
How do I know which size and quantity to buy?
Each product page includes the approximate yield or consumption (for example kg/m² or metres of bead per cartridge) in the "Technical specifications" section. Calculate the surface area or thickness of your project and multiply by that consumption to find out how many units you need. If in doubt, contact us with the measurements of your job.
Where can I find the complete technical data sheet (Product Data Sheet)?
The description of each product already includes the main technical data (strengths, setting times, application temperature, applicable standards, etc.), taken from the official Sika Spain Product Data Sheet. If you need the complete PDF data sheet or the safety data sheet (SDS), write to us and we will send it to you.
Do these products comply with European regulations (CE marking)?
Most Sika products carry the CE marking in accordance with the relevant European standard (for example EN 1504 for structural repair, EN 12004 for tile adhesives, EN 13888 for grouts or EN 15651 for sealants). The exact standard for each reference is detailed in the "Standards and certificates" section of its product page.
What protective equipment do I need to apply them?
It depends on the product: cement-based mortars and adhesives are usually irritating to skin and eyes (gloves, goggles and a mask are recommended), while polyurethane sealants and adhesives require good ventilation. Always check the safety section of the product page and its safety data sheet (SDS) before use.
How should I store these products and how long do they last unopened?
Shelf life and storage conditions (temperature, humidity, protection from light) vary depending on the type of product (cementitious, polyurethane, epoxy, etc.) and are stated on the packaging and in the data sheet of each reference. In general, it is advisable to store in a dry place, protected from frost and direct sunlight.
Can I return a Sika product if I haven't used it?
Yes, you have 14 calendar days from receipt to exercise your right of withdrawal, provided the product is in its original packaging and has not been opened. The cost of return shipping is borne by the customer. Contact us at info@vetonek.com or via WhatsApp on +34 629 571 735.
How long does my order take to arrive?
We ship to mainland Spain, the Balearic Islands, Portugal and the other European countries we serve (France, Belgium, the Netherlands, Germany, Italy, etc.). The estimated delivery time is 3 to 9 working days (no shipping to the Canary Islands, Ceuta or Melilla).
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