Davcoflex® 669
Davcoflex® 669 is a single component polymer modified cementitious tile adhesive for bonding homogenous vitrified tiles and ceramic glazed tiles on both internal and external area.
- Good workability
- Enhanced adhesion of low-porosity tiles
- No mixing error-just add water
- Extensive range of applications for interior and exterior wall and floor installation
Usage
Davcoflex® 669 is suitable to bond the following type of tile:- Homogeneous vitrified tiles, ceramic glazed tiles
- All type of low and high absorption tiles
- Concrete
- Cement-sand screed & render
- Light weight concrete blocks (to be primed with Davco Bonding Agent)
- Fibre-cement boards (seek advice from manufacturer)
Advantages
- Good workability
- Enhanced adhesion of low-porosity tiles
- No mixing error-just add water
- Extensive range of applications for interior and exterior wall and floor installation
Packaging
25 kg bag
Colour
Grey powder
Product Details
APPROVALS / CERTIFICATES
Davcoflex® 669 is classified as C2TE conforming with EN 12004, without testing for tensile adhesion properties after freeze-thaw.
Davcoflex® 669 is a cementitious adhesive (C) with improved adhesion (2), slip resistance (T), and extended open time (E).
Shelf life
6 months from date of production
Storage conditions
Store properly in dry conditions, in undamaged and unopened, original sealed packaging. Keep away from direct sunlight, rain, water and moisture.
Tensile adhesion strength
| Standard Condition | ≥ 1.0 N/mm² |
| Water Immersion | ≥ 1.0 N/mm² |
| Heat Ageing | ≥ 1.0 N/mm² |
Application
Slip resistance
| ≤ 0.5 mm | (EN 12004–2:2017, |
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
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 | ~2.0–3.0 kg/m² | 3 mm x 3 mm notched trowel |
| Normal size tiles (20 cm x 20 cm) | ~5.0–5.5 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) | ~10.0–11.0 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 Davcoflex® 669 while mixing. 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
Davcoflex® 669 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 adequate material and good bonding 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 the tiles. Ensure there are no voids under the tiles and the edges between the tiles are even (lippage) with a consistent joint 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.