Sikagard®-550 W Elastic
CRACK BRIDGING PROTECTIVE COATING FOR CONCRETE
Sikagard®-550 W Elastic is a one part, plasto-elastic coating based on UV-curing acrylic dispersion with excellent crack-bridging properties even at temperatures below 0 °C.
Sikagard®-550 W Elastic complies with the requirements of EN 1504-2 as protective coating.
- 1-part ready to use
- Applied by brush, roller or airless spray
- Available in many colours
- Crack-bridging at low temperatures (-20 °C)
- Easily maintained by overcoating
- Free of toluene and other aromatic solvents
- Good adhesion to concrete
- High diffusion resistance against CO2 reducing the rate of carbonation
- Reduced tendency to dirt pick-up and contamination
- Very good resistance against weathering and ageing
- Water vapour permeable
- Water-based
Usage
As a protective and decorative coating the product can be used for the following applications:- New concrete or reinforced concrete structures and elements at risk of cracking
- Concrete repair refurbishment works over Sika® pore filling or smoothing mortars and overcoating existing firmly bonded coatings
- Reducing the deterioration of concrete and assisting with controlling the corrosion of any embedded steel reinforcement
- Increasing the service life to all types of concrete structures and elements subject to cracking / cyclic movement
- Buildings
- Bridges
- Car parks
- Protection against ingress (Principle 1, method 1.3 of EN 1504-9),
- Moisture control (Principle 2, method 2.3 of EN 1504-9)
- Increasing the resistivity (Principle 8, method 8.3 of EN 1504-9)
- Ozone or electrolysis water treatment
- High chlorine concentrations (determined in DIN 19643-2) may cause chalking and discolouration
Advantages
- 1-part ready to use
- Applied by brush, roller or airless spray
- Available in many colours
- Crack-bridging at low temperatures (-20 °C)
- Easily maintained by overcoating
- Free of toluene and other aromatic solvents
- Good adhesion to concrete
- High diffusion resistance against CO2 reducing the rate of carbonation
- Reduced tendency to dirt pick-up and contamination
- Very good resistance against weathering and ageing
- Water vapour permeable
- Water-based
Packaging
15 L container
Colour
Thixotropic liquid
Final appearance: Smooth matt finish
Available in many colours.
Product Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to EN 1504-2 - Surface protection product for concrete - Coating
- Surface protection system OS-DII ZTV-SIB 90, Sika MonoTop®-620, Sikagard®-545 W Elastofill / -550 W Elastic, Institut für Bauforschung Germany, Test report No. A 2714/D2/V12
- Performance testing, EN 1504-2, Sikagard®-550 W Elastic, LPM AG, Report No. A-33'882-1, A-33'882-2E
- Determination of crack bridging, EN 1062-7, kiwa, Report No. P 8690a
Product Declaration
EN 1504-2: Surface protection product for concrete - Coating
Chemical Base
Acrylate dispersion
Shelf Life
24 months from date of production.
Storage Conditions
The product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +25 °C.
Always refer to packaging.
Density
~1.39 kg/l (at +20 °C)
Solid content by weight
~66.1 %
Solid content by volume
~53.4 %
System Structure
| System | Product | Number of applications |
| Priming | Sikagard®-552 W Aquaprimer or Sikagard®-551 S Elastic Primer | 1 |
| Top coat | Sikagard®-550 W Elastic | 2–3 |
*For intensive yellow or red colour shades and / or a dark substrate, more than 2 coats maybe required (or greater thickness per coat).
Primer options
| Normal absorbent concrete | Sikagard®-552 W Aquaprimer |
| Dense, non-absorbent concrete | Sikagard®-551 S Elastic Primer |
Sika® levelling / re-profiling mortars, weak concrete with a tensile adhesion strength < 1 N/mm2:
Sikagard®-551 S Elastic Primer with up to 10 % Sika® Thinner C
Very dense concrete:
Sikagard®-551 S Elastic Primer with up to 10 % Sika® Thinner C
Crack Bridging Ability
| 2 coats | Class A1 (-20 °C) |
| 3 coats | Class B2 (-15 °C) |
Tensile Adhesion Strength
| 2.9 (2.8) N/mm² | (EN 1542) |
Capillary Absorption
| w = 0.02 kg/(m2h0.5) | (EN 1062-3) |
Permeability to Water Vapour
| Dry film thickness | d = 230 µm |
| Equivalent air layer thickness | SD, H2O = 0.35 m |
| Diffusion coefficient H2O | µH2O = 1.5 × 103 |
| Requirements for breathability | ≤ 5 m |
Permeability to Carbon Dioxide
| Dry film thickness | d = 160 µm |
| Equivalent air layer thickness | SD, CO2 = 51 m |
| Diffusion coefficient CO2 | µCO2 = 3.1 × 105 |
| Requirements for protection | SD, CO2 ≥ 50 m |
Behaviour after Artificial Weathering
| Pass after 2000 hours | (EN 1062-11) |
Freeze Thaw De-Icing Salt Resistance
| 2.9 (2.1) N/mm² | (EN 13687 part 1 & part 2) |
Application
Layer Thickness
Minimum required dry film thickness to achieve the required characteristics (CO2 equivalent air thickness of 50 m) ≈ 160 μm.
Minimum required dry film thickness to achieve full durability characteristics (CO2 diffusion, adhesion after thermal cycling and crack bridging) ≈ 340 μm.
Ambient Air Temperature
+8 °C min. / +35 °C max.
Relative Air Humidity
< 80 %
Dew Point
Substrate and ambient temperature must be at least 3 °C above dew point.
Substrate Temperature
+8 °C min. / +35 °C max.
Waiting Time / Overcoating
Waiting time between coats at +20 °C substrate temperature:
| Previous coating | Next coating | Waiting time |
| Sikagard®-552 W Aquaprimer | Sikagard®-550 W Elastic | 5 hours min. |
| Sikagard®-551 S Elastic Primer | Sikagard®-550 W Elastic | 18 hours min. |
| Sikagard®-550 W Elastic | Sikagard®-550 W Elastic | 8 hours min. |
Times are approximate and will be affected by film thickness, changing ambient conditions particularly temperature and relative humidity.
When application is on existing coatings, the waiting time for both primers will increase by 100 %.
Maintenance coats of Sikagard®-550 W Elastic can be applied without priming if the existing coat has been thoroughly cleaned.
Applied Product Ready for Use
Full cure: ~7 days at +20 °C
Times is approximate and will be affected by film thickness, changing ambient conditions particularly temperature and relative humidity.
Consumption
| Product | Per coat |
| Sikagard®-551 S Elastic Primer | ~0.10–0.15 kg/m2 |
| Sikagard®-552 W Aquaprimer | ~0.10–0.15 kg/m2 |
| Sikagard®-550 W Elastic | ~0.25–0.35 kg/m2 |
These figures are theoretical and do 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.
APPLICATION
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
Reference must be made to the Sika Method Statement: Protective Coatings
Note: Confirm waiting / overcoating times of any previous mortars, primers or coats is achieved before applying subsequent coats. (Refer to waiting / overcoating time in Application Information)
Note: Confirm product application conditions: substrate moisture content, substrate, air and product temperatures, relative humidity and dew point.
Note: Make sure the application area is well ventilated during application and drying.
Note: To prevent air bubbles affecting the finish, do not 'over' brush, roller or spray.
Protective coating
Manual application
- Apply the Product evenly over the surface with a brush or short pile fleece roller at the required consumption.
- Control the layer thickness during application using a thickness gauge to achieve the required total dry film thickness.
- The coating must be continuous, pore free and to the required surface finish.
- Protect the Product from heavy rain or rain showers until dry to prevent surface damage.
- Apply additional coats as required.
Airless spray application
IMPORTANT
Do not use aerosol car body type spraying equipment
- Spray apply the product in a continuous cross-spray operation and at a speed to achieve a consistent thickness and the required surface finish.
- Control the layer thickness during application using a thickness gauge.
- The coating must be continuous, pore free and to the required surface finish.
- Protect the Product from heavy rain or rain showers until dry to prevent surface damage.
- Apply additional coats as required.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use.
Hardened material can only be mechanically removed.
For Sikagard®-551 S Elastic Primer use Sika® Thinner C.