SikaCeram®-255 Large Tile
SikaCeram®-255 Large Tile is a high performance cementitious improved powdered, floor and wall adhesive with no vertical slip and extended open time for fixing large ceramic tiles, vitrified tiles, glass mosaic and natural stone. For residential, industrial and commercial wet and dry environments up to 10 mm thickness. Indoor and outdoor use. EN 12004: Classification C2TE*.
- Layer thickness: 1–10 mm
- Extended open time
- Reduced vertical slip
- Smooth application
- Typical bonding substrates: Cementitious screed, concrete, plaster, ceramic tiles, calcium sulphate screed, gypsum fibre boards
Usage
Bonding the following types of tiles:- All kinds of medium, large-sized tiles
- Ceramic
- Vitrified
- Glass mosaic
- Earthenware
- Porcelain
- Stoneware
- Terrazzo
- Unglazed
- Marble and natural stone
- Balconies
- Bathrooms
- Commercial / Residential environments
- Facades
- Kitchens
- Swimming pools
- Terraces
- Wet areas
- Industrial floors
- Heavy trafficked floors
- Overlaying existing indoor sound ceramic tiles or stones
- Interior and exterior use
Advantages
- Layer thickness: 1–10 mm
- Extended open time
- Reduced vertical slip
- Smooth application
- Typical bonding substrates: Cementitious screed, concrete, plaster, ceramic tiles, calcium sulphate screed, gypsum fibre boards
Packaging
25 kg bag
Colour
Grey or White powder
Product Details
Product declaration
C2TE* according to EN 12004-1
C2TE* according to ISO 13007-1
*Tensile adhesion strength test after freeze-thaw cycles not conducted due to tropical climatic conditions
Chemical base
Portland cement, selected aggregates, water retention additives, re-dispersible polymer
Shelf life
12 months from date of production
Storage conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +35 °C.
System structure
For the following substrates, a primer must be used:
| Substrate | Primer |
| Calcium sulphate substrate (gypsum, gypsum fibre boards, calcium sulphate screed) | SikaCeram®-935 Floor Leveler Primer diluted with water in ratio 1:1 |
Tensile adhesion strength
| Initial / dry condition | ≥ 1.0 N/mm2 |
| After water immersion / wet condition | ≥ 1.0 N/mm2 |
| After heat ageing | ≥ 1.0 N/mm2 |
| After > 30 minutes, open time | ≥ 0.5 N/mm2 |
Application
Slip resistance
| ≤ 0.5 mm | (EN 12004-2 / ISO 13007-2) |
Mixing ratio
| Packing | Water to powder ratio by weight | Quantity of water per bag |
| 25 kg, Grey | 0.25–0.28 | 6.25–7.00 L |
| 25 kg, White | 0.27–0.29 | 6.75–7.25 L |
Fresh mortar density
| Grey | 1.70 ± 0.20 kg/L (+27 °C) |
| White | 1.70 ± 0.20 kg/L (+27 °C) |
Layer thickness
10 mm max.
Ambient air temperature
+5 °C min. / +35 °C max.
Substrate temperature
+5 °C min. / +35 °C max.
Maturing time
~5 minutes
Pot life
≥ 180 minutes (100 g mass, +27 °C)
Open time
| > 30 min | (EN 12004-2 / ISO 13007-2) |
Adjustability time
~40 min (+27 °C)
Applied product ready for use
| Use | Waiting time |
| Grouting floors / walkability | 24–36 hours |
| Grouting walls | 4–6 hours |
| Water immersion | ~21 days |
Values determined in laboratory conditions: +23 °C ± 2 °C, R.H. 50 % ± 5 %. Higher temperatures will reduce the indicated waiting time, lower temperatures increase waiting time.
Consumption
Consumption is dependent on the substrate, surface profile, roughness, size of the tiles, the joints between them and application technique (i.e. single spreading / floating method or double spreading / buttering method). Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application.
As a guide for a single adhesive layer:
| Size of tiles | Notched trowel size | Consumption (Grey) dry powder | Consumption (White) dry powder |
| Small | 6 mm | 2.50–3.00 kg/m2 | 2.75–3.25 kg/m2 |
| Medium | 8 mm | 3.00–3.50 kg/m2 | 3.50–4.00 kg/m2 |
| Large | 10 mm | 3.75–4.25 kg/m2 | 4.25–4.75 kg/m2 |
MIXING
Important: Avoid over-mixing to minimise air entrainment.
Requirement: Use a low speed electric single paddle mixer (< 500 rpm) with spiral paddle for mixing.
- Pour the minimum recommended quantity of clean cold water into a clean mixing container.
- Gradually add SikaCeram®-255 Large Tile powder to the water while mixing.
- Mix thoroughly for ~5 minutes until a uniformly coloured, smooth mix is achieved. Add additional water, if necessary, to the maximum specified amount.
- Do not mix for ~5 minutes to allow mixed product to ‘mature’.
- Remix for ~15 seconds.
APPLICATION
Important: Apply sufficient adhesive to ensure adequate ‘wetting’ of the backs of the tiles.
Important: Coverage on the back of the tiles must be 100 %.
Important: Tiling must be carried out on freshly applied adhesive. Exert adequate pressure to ensure 100 % complete and uniform contact with the adhesive to achieve optimum adhesion.
Important: If a skin forms on the surface of the adhesive, immediately remove the adhesive layer with a trowel, discard material and apply a fresh layer of SikaCeram®-255 Large Tile adhesive.
Important: Protect freshly applied material from freezing conditions and rain, etc.
Important: For natural stone tiles, always carry out a preliminary test application first.
Note: On cementitious substrates, SikaCeram®-255 Large Tile can be used for laying non-absorbent tiles indoors up to 24 ft2 (e.g. 4 ft × 6 ft). On walls up to 8 ft height, non-heated floors and outdoor applications up to 8 ft2 (e.g. 2 ft× 4 ft).
Note: For tiles > 900 cm2 (30 × 30 cm), the double-spreading (buttering) technique is always recommended.
- Apply sufficient adhesive to the prepared fixing surfaces with the flat side of trowel.
- Comb additional adhesive with appropriate square notched trowel to the required bed thickness.
- Wherever needed (for large tiles), back butter the tiles for full bedding.
- Place tiles into wet, sticky adhesive and use rubber mallet to fully embed the tiles.
- Adjust tiles if required. Provide support wherever needed.
- Clean off surplus adhesive from tile face and between tile joints before the adhesive has dried.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.