SikaCeram®-255 StarFlex LD
SikaCeram®-255 StarFlex LD is a cement-based, improved, deformable, low dust, one-pack tile adhesive. It can be used in layers up to 15 mm thick. SikaCeram®-255 StarFlex LD is suitable for setting all kind of tiles on both floors and walls, inside and outside for residential and commercial areas on heated floors, balconies and terraces. C2 TE S1 classified according to EN 12004.
- Deformability
- No vertical slipping
- Extended open time
- Low dust emission
- Frost resistant
- Smooth application
Usage
SikaCeram®-255 StarFlex LD is suitable for bonding the following types of tiles:- All kinds of ceramic tiles
- Grès porcelain in large size and in thin slabs
- Earthenware tiles
- Gypsum- or cement based substrates
- Plasterboards
- Cellular concrete
- Existing ceramic tiles, stones, paints in indoor
- Existing PVC sheet, linoleum and vinyl tiled floors indoors
- Swimming pools
- Areas with underfloor heating, water and electric systems
- Industrial and heavy traffic floors
- Facades
- Balconies and terraces
- Spot-gluing insulating panels made of polystyrene, polyurethane foam, rock or glass wool
Advantages
- Deformability
- No vertical slipping
- Extended open time
- Low dust emission
- Frost resistant
- Smooth application
Packaging
25 kg bag
Colour
Grey powder.
Product Details
ENVIRONMENTAL INFORMATION
VOC emission classification according to French regulation classification A+.
APPROVALS / STANDARDS
Improved deformable cementitious adhesive with reduced slip and extended open time classified C2TE S1 according to EN12004:2007.Declaration of performance n. 46397076, assessed by notified laboratory 1599, and provided with CE marking.
Chemical Base
Portland cement, selected aggregates, water retention additives, re-dispersible polymer
Shelf Life
12 months from date of production
Storage Conditions
Undamaged original sealed packaging, in dry and cool conditions
Maximum Grain Size
Dmax: 0.63 mm
Product Declaration
| C2TE S1 | (EN12004) |
System Structure
For the following substrates, a primer must be used:
| Substrate | Primer |
| Gypsum plaster or anhydrite screed | Sika® Primer-11 W / Sikafloor®-01 Primer |
| Existing ceramic tiles, PVC sheet, linoleum and existing vinyl tiled floors | Sika® Primer-21 W / Sikafloor®-02 Primer |
Application and consumption details of the primers are given in the respective Product Data Sheets.
Tensile Adhesion Strength
| Initial | ≥ 1.5 N/mm2 |
| Water immersion | ≥ 1.0 N/mm2 |
| Heat ageing | ≥ 1.0 N/mm2 |
| Freeze-thaw cycles | ≥ 1.0 N/mm2 |
Transverse deformation
| ≥ 2.5 mm | (EN 12002) |
Application
Slip Resistance
| ≤ 0.5 mm | (EN1308) |
All data collected from test reports released by laboratory Modena Centro Prove, Notified Body 1599.
Mixing Ratio
7.25 litres of water per 25 kg bag
29 % ± 1 %
Fresh Mortar Density
~1.6 kg/l
Layer Thickness
15 mm max.
Ambient Air Temperature
+5 °C min. / +35 °C max.
Substrate Temperature
+5 °C min. / +35 °C max.
Maturing Time
~3 min
Pot Life
~6 hours
Open Time
| ≥ 0.5 N/mm2 after 30 min | (EN 1346) |
Adjustability Time
~50 min
Curing Time
24–36 hours.
Curing Treatment
Protect from adverse weather conditions, such as extremely high or low (freezing) temperatures, rain, direct exposure to sun, for at least 12–24 hours from application.
Applied Product Ready for Use
| Use | Waiting time |
| Grouting on floors / walkability | 24–36 hours. |
| Grouting on walls | 4–6 hours. |
| Full traffic / use | ~14 days |
| Filling with water | ~21 days |
Values determined at laboratory conditions: 23 °C ± 2 °C, R.H. 50 % ± 5 %. Higher temperatures will reduce the indicated waiting time, lower temperatures increase them.
Consumption
Consumption is always dependent on the substrate surface profile and roughness, the size of the tiles and the joints between them, as well as on the application technique (single adhesive layer on the substrate, or with an additional ‘buttering’ layer on the back of the tiles). As a guide:
| Size of tiles | Notched trowel size | Consumption |
| Small | 6 mm - square | ~2.5 kg/m2 |
| Medium | 8 mm - square | ~3.5 kg/m2 |
| Large | 10 mm - square | ~6 kg/m2 |
MIXING
Pour the recommended amount of water into a suitable, clean mixing container. Whilst stirring slowly, slowly add the SikaCeram®-255 StarFlex LD powder to the water and then mix thoroughly using a low speed (~500 rpm) electric mixer until a completely homogeneous and lump-free mix is achieved.
After mixing, leave the material to stand and ‘mature’ for a few minutes, and then briefly stir again immediately prior to application. The resulting mix has a very creamy consistency and is easy to apply and spread.
APPLICATION
- SikaCeram®-255 StarFlex LD is applied using a notched trowel.
- Apply sufficient product to ensure complete ‘wetting’ of the back of the tiles.
- Tiling must to be carried out on freshly applied adhesive, applying adequate pressure to ensure complete and uniform contact with the adhesive and thus optimum bond. If a film is seen to form on the surface, the adhesive has been left for too long; should this happen, then immediately remove the adhesive layer with the trowels, discard this material and apply a fresh layer of SikaCeram®-255 StarFlex LD adhesive.
- Avoid application in direct sunlight and/or strong wind / draughts.
- SikaCeram®-255 StarFlex LD is suitable for laying absorbent and non-absorbent tiles indoors without any size or support limits.
- SikaCeram®-255 StarFlex LD is ideal for laying non-absorbent tiles outdoors up to 10 000 cm2 (e.g. 60 × 120 cm) on floors and up to 7000 cm2 (e.g. 80 × 80 cm) on walls on cementitious, non-heated substrates.
- To lay any tiles larger than 900 cm2 (e.g. 30 x 30 cm), the double-spreading (buttering) technique is always recommended.
CLEANING OF TOOLS
Thoroughly clean all tools and equipments with clean water before the product has set, preferably immediately after use. Once hardened the product can only be removed by mechanical means.
