SikaCeram® FLX 25
(former MTile FLX 25)
High performance, highly deformable, multi-purpose tile adhesive for large format ceramic coverings, mosaic, porcelain and moisture tolerant natural stone
SikaCeram® FLX 25 is a high performance, one-pack, polymer containing, water resistant, premixed adhesive. Consisting of portland cement, sand and specific additives. Suitable for use in hot and tropical climatic conditions.
- Easy to mix and use
- Smooth application
- Single component system
- Water resistant
- Highly deformable
- Excellent adhesion to various substrates
- No vertical slipping, non-sag
Usage
- Suitable for indoor and outdoor use on walls and floors
- Suitable for bonding of non-vitrified tiles, vitrified tiles, fully vitrified tiles, porcelain mosaic, glass mosaic, glass tiles, brick tiles, terracotta, artificial and non-staining moisture tolerant natural stone
- Suitable for swimming pools, pool surroundings, wet rooms and cold storage depots
- Suitable to be applied on cement screeds, ground anhydrite and/or gypsum based floated screeds, precast concrete elements, aerated concrete, heated screeds, plasterboards, gypsum fiber boards, dry screeds, insulation boards, plaster slabs, plaster, masonry, old ceramic tiles and sound wooden substrates such as wooden chipboards, OSB boards, cork rubber mats, etc.
- Suitable to apply directly on various Sika® waterproofing products
- Suitable for laying tiles on top of impact sound insulation mats
- Suitable for bonding of very large sized tiles
Advantages
- Easy to mix and use
- Smooth application
- Single component system
- Water resistant
- Highly deformable
- Excellent adhesion to various substrates
- No vertical slipping, non-sag
Packaging
20 kg bag
Colour
Grey powder
Product Details
CERTIFICATES AND TEST REPORTS
SikaCeram® FLX 25 meets the requirements of EN 12004-1 for class C2TES2
Composition
Powder mixture with elastifying polymers. Does not contain any asbestos or other mineral fibers. No injurious silica dust during the application.
Shelf life
12 months from date of production
Storage conditions
Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +35°C. Protect from direct sunlight, heat and moisture.
System structure
In normal conditions, no primer is required. However, for very high absorbent substrates or non-absorbent substrates, please contact Sika Technical Service for recommendation.
Transverse deformation
Value w/p=0.28 | Requirements EN 12004-1, |
≥ 5.0 mm | ≥ 5.0 mm |
Tensile adhesion strength
w/p = 0.28 | Value | Requirement EN |
Initial | ≥ 2.0 N/mm2 | ≥ 1.0 N/mm2 |
After water immersion | ≥ 1.0 N/mm2 | ≥ 1.0 N/mm2 |
After heat ageing | ≥ 1.0 N/mm2 | ≥ 1.0 N/mm2 |
Service temperature
-30°C min. / +80°C max.
Application
Slip resistance
Value | Requirements EN 12004-1, |
≤ 0.5 mm | ≤ 0.5 mm |
Layer thickness
Max. 10 mm (locally up to 12 mm thickness possible, for small area leveling purpose)
Ambient air temperature
+5°C min. / +40°C max.
Mixing ratio
5.6 L of water per 20 kg bag
Maturing time
~3 min (Slake time)
Pot Life
~35 min (at +25°C)
Open Time
≥ 30 min. (at +23°C ± 2°C, RH: 50% ± 5%) | (EN 12004-2) |
Applied product ready for use
Tiles can be grouted | ~24 h |
Foot traffic | ~24 h |
Able to bear weight | ~7 days |
Fully cured | ~28 days |
Values determined in laboratory conditions: +25°C ± 2°C, R.H. 50 % ± 5 %.
Higher temperatures will reduce the indicated waiting times, lower temperatures will increase the indicated waiting time.
Consumption
Powder consumption and coverage depends on the surface profile and roughness of the substrate, size and reverse profile of the tiles and the placing technique (simple placing "floating" or back to back “buttering-floating”).
As a guide for solid bed application:
For 1 mm thickness over 1 m2 area approximately 1 kg of powder is required.
This figure is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment. Above consumption indications refer to the installation of slightly profiled, non-vitrified or vitrified tiles on flat substrate e.g. render or cement screed.
For small sized tiles (side ≤30 cm), use small squared notch size trowel (4 - 6 mm) and progressively increas for medium tiles (side ≤45 cm, trowel 6 - 8 mm) or large tiles (side ≤60 cm, trowel 8 - 10 mm).
EQUIPMENT
Select the most appropriate equipment required for the project:
Substrate preparation equipment:
- Grinding equipment
- Abrading equipment
- Power washing equipment
- Sandblasting equipment
Mixing equipment:
-
Low speed electric double paddle mixer (300–400 rpm) with a spiral mixing paddle.
Application equipment:
- Notched trowel, various sizes
SUBSTRATE QUALITY
Minimum age of the substrate:
- SikaScreed® or SikaLevel® range – 3 days
- Cement screed - 28 days
Note: The screed drying time is subject to the screed thickness and site conditions. For applications before 28 days please contact Sika's Technical Service Department.
Newly applied cement screeds must not have a residual moisture content over 4%, anhydrite and/or gypsum-based screeds not more than 0.5% (measured with a CM meter).
SUBSTRATE PREPARATION
- Cementitious substrates must be sufficiently cured and dried.
- All substrates must be structurally sound, able to support the weight of the new tiling and provide a firm and securely fixed background.
- The substrate must be flat, tight and free from easily removable parts, non-deformable and correctly aged.
- Substrates must be clean, dry, free of any loose or friable particles, contaminants such as dust, dirt, oil, wax polish, grease, cement laitance or efflorescence.
- Use adequate mechanical preparation techniques to remove from the substrate, all traces of any materials that could reduce the product's adhesion to the substrate.
- The substrate must be plumb and flush in accordance with BS 5385. Plaster substrates must be approved by the plaster manufacturer for fixing ceramic tiles and must be suitable for the intended area of use.
- Smooth surfaces must be roughened lightly to improve adhesion.
- To confirm adequate surface preparation and adhesion, carry out a small trial before full application.
- For larger and thicker areas of substrate re-profiling, use suitable mortars from the Sika MonoTop® or SikaEmaco® range. Level concrete floors with SikaScreed® or SikaLevel® range.
- For any repairs of the substrate materials of SikaEmaco®, SikaRep® or Sika MonoTop® range should be used, applied at least 24 hours before laying the ceramic tiles.
- Identify cracks in the substrate and seal appropriately with e.g. Sikadur® epoxy resins.
- For applications in hot climates / environments, or on absorbent substrates, thoroughly pre-dampen (saturate) the substrate before product application. Avoid any ponding / standing water on the substrate. Surface must not be damp to touch.
- For tiling in constantly damp or wet rooms, a suitable Sika® waterproofing product / system must be applied to the substrate before tiling.
- For large sized tile application, joints in the substrate idealy should be mirrored in joints between tiles, or decoupling membrane should be used. Contact Sika Technical Service for recommendation.
- Prime very absorbent cement-based substrates and aerated concrete with suitable primer. Contact Sika Technical Service for recommendation.
- Prior to tile-on-tile applications or any other unconventional build-up, contact Sika Technical Services for recommendation.
MIXING
-
Mix a bag with the necessary, above mentioned, amount of water, using an electric blender with a double mixing spiral at low speed, in a clean bucket, to obtain a smooth paste free of lumps.
- Use a blender at 500 rpm maximum; do not mix at faster rate because of mechanical strength decay of the cured product.
- Allow a maturing time (slake time) of approx. 3 minutes for SikaCeram® FLX 25 in the mixing container, then remix briefly prior to application.
- Always start with minimum recommended quantity of water (water/powder ratio), only if required, gradually add water to desired consistency. Do not exceed the maximum allowed limit of water per bag weight.
- The obtained mix results should be very creamy, easily spreadable and thixotropic.
- Do not mix more material than can be used within 30 minutes.
APPLICATION
SikaCeram® FLX 25 is applied using notched trowel. The amount of product should be enough to ensure complete wetting of the tiles rear. Tiling has to be carried out on fresh glue exerting an adequate pressure to ensure contact with the adhesive and thus the perfect bonding. In case a surface film is formed on the adhesive (skinning), it is necessary to wipe it off and re-apply. Avoid wetting already applied adhesive with water, as it may negatively affect its properties. Note: For tiles > 900 cm2 (30 x 30 cm), the double spreading ("buttering") technique is always recommended.
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Adhesive application:
- Apply a thin scratch coat to the substrate with the smooth edge of the trowel.
- Comb mortar onto the fresh scratch coat with a notched trowel.
- Apply sufficient adhesive to the prepared fixing surfaces with the notched trowel to the required bed thickness, in one direction.
- Place the tiles in the adhesive bed with a twist and slide motion and adjust to correct position.
- Adjust the tiles if required.
- Clean off surplus adhesive from tile face and between tile joints before the adhesive has dried.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.