Davco SAC 28 ECO
Davco SAC 28 ECO is a premium grade, single component polymer modified flexible cement-based tile adhesive, supplied ready to use with the addition of water.
- Environmentally friendly
- High bonding performance and deformability
- Build-in flexibility to absorb vibration, shrinkage and deflection of substrates
- Enhanced adhesion of low-porosity tiles to dense impervious substrates
- No mixing error – just add water
Usage
Davco SAC 28 ECO is suitable for tiling of large format fully vitrified tiles, marble & granite. Davco SAC 28 ECO can be used on:- Cement-sand screed & render
- Existing ceramic, quarry and natural stone surfaces.
- Flexible building boards eg. fibre cement sheet and plasterboard
- Light weight concrete blocks (to be primed with Davco Bonding Agent)
- Fibre-cement boards (to be primed with Davco Bonding Agent)
Advantages
- Environmentally friendly
- High bonding performance and deformability
- Build-in flexibility to absorb vibration, shrinkage and deflection of substrates
- Enhanced adhesion of low-porosity tiles to dense impervious substrates
- No mixing error – just add water
Packaging
25 kg bag
Colour
Grey powder
Product Details
APPROVALS / CERTIFICATES
- Davco SAC 28 ECO is classified as C2TE S1 conforming with EN 12004, without testing for tensile adhesion properties in freeze-thaw condition.
Davco SAC 28 ECO is a cementitious adhesive (C) with improved adhesion (2), slip resistance (T), extended open time (E), and deformable (S1). - Singapore Green Label: 022-066-0362 "Eco-Friendly Building Material"
Shelf life
6 months from date of production
Storage conditions
Store properly in dry conditions, in undamaged and unopened, original sealed packaging.
Tensile adhesion strength
| Standard condition | ≥ 1.0 N/mm² |
| Water immersion | ≥ 1.0 N/mm² |
| Heat aging | ≥ 1.0 N/mm² |
Transverse deformation
| 2.5 mm ≤ S1 Classification ≤ 5.0 mm, Classified as S1 | (EN 12004–2:2017, |
Application
Slip resistance
| ≤ 0.5 mm | (EN 12004–2:2017, 8.2) |
Mixing ratio
5.75–6.50 L of water per 25 kg bag
Open Time
| ≥ 0.5 N/mm² at 30 minutes (at 23 °C) | (EN 12004–2:2017, 8.1) |
Under unfavourable conditions (direct sun, high ambient temperature and strong wind), the open time may be shorter.
Adjustability time
~15 minutes at 25 °C
Curing time
~24 hours at 25 °C
Consumption
This depends on the level, profile and surface roughness of the substrate, the size of the tiles and the technique of placing (simple placing or "back"-buttering).
As a guide, in kilogram of powder per m² on flat surfaces:
| Tiles size | Coverage | Trowel size |
| Mosaics and small tiles | ~1.5–2.5 kg/m² | 3 mm x 3 mm notched trowel |
| Normal size tiles (20 cm x 20 cm) | ~3.0–4.0 kg/m² | 6 mm x 6 mm notched trowel |
| Large size tiles up to 3 600 cm² (internal floors) and 2 100 cm² (external floors) | ~7.0–8.0 kg/m² | 12 mm x 12 mm notched trowel |
The consumption above may only serve as a guide. It is highly recommended to carry-out trials on site to determine the actual coverage.
MIXING
- Pour clean water into a mixing container. Then, slowly add Davco SAC 28 ECO. Do not dump!
- Mix continuously in a circular motion using a low-speed mechanical mixer until a lump-free, creamy consistency and uniform paste is achieved.
- Allow the mix to stand for 5 minutes and re-mix prior to use.
APPLICATION
Davco SAC 28 ECO is spread onto the substrate using a proper and suitable notched trowel. The choice of trowel should be governed by the size of the tiles, depth of knobs, grooves or ridges on the back of the tiles and the evenness of the substrate.
Use the flat side of the notched trowel to spread the mix onto the receiving surface at approximately 1 m² at a time. Then, use the notched side of the trowel to apply the required amount of the mix in one direction.
Press the tile in a perpendicular motion and tapped into position to ensure positive contact with the adhesive and adjust within 30 minutes.
For tile with grooves or ridges, it is necessary to skim a layer of adhesive / butter coat the back of the tiles. This is to ensure good bonding and adequate coverage between the adhesive and tile.
Ensure that the adhesive is wet when the tiles are laid. Do not allow the adhesive to skin-over prior to tilling. Should skinning occur, break the skin by re-trowelling the adhesive in the opposite direction.
Do not spread more than 1 m² at any one time. Fix tiles within 15 minutes of applying the adhesive and check the contact by occasionally lifting tiles. Ensure there are no voids under the tiles and the edges between the tiles are even (lippage) with a consistent tile joints width.
For external areas, protect from direct sunlight and rain by means of a shelter. It is the user’s responsibility to determine the condition and suitability of all surfaces prior to application.
Grouting
Tile joint grouting should preferably be carried out at least 24 hours after completion of tiling or until the adhesive has set and dry sufficiently.
Setting may be delayed on dense or impervious surface.
CLEANING OF EQUIPMENT
Clean all tools and application equipments with clean water immediately after use. Hardened or cured material can only be removed mechanically.
FAQ
For tiling outdoors, an improved cementitious adhesive with extended open time (C2TE) or an improved deformable cementitious adhesive with extended open time (C2ES1) is recommended.
- C2 Tensile adhesion ≥ 1.0 N/mm² (after normal curing, water immersion, heat aging and freeze-thaw cycles)
- E Open time ≥ 30 minutes
- S1 Transverse deformation ≥ 2.5 mm and < 5 mm
Sika's product:
Tile adhesives that are categorised under C2TES1 are recommended to be use in swimming pools.
C2TES1 = Improved deformable cementitious adhesive with reduced slip and extended open time.
- C2 Tensile adhesion ≥ 1.0 N/mm² (after normal curing, water immersion, heat aging and freeze-thaw cycles).
- T Slip ≤ 0.5 mm
- E Open time ≥ 30 minutes
- S1 Transverse deformation ≥ 2.5 mm and < 5 mm
Sika also recommends the use of epoxy tile grout for filling up grout joints in-between tiles in swimming pools.
Sika’s Tile Adhesive:
Sika’s Epoxy Tile Grout:
- Davcopoxy 271