Sikagard®-550 W Elastic
Crack bridging protective coating for concrete
Sikagard®-550 W Elastic is a one component, 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.
- Crack-bridging even at low temperatures (-20°C)
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water vapour permeable
- Very good resistance against weathering and ageing
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- The system is resistant to aggressive atmospheric influences
Usage
Sikagard®-550 W Elastic is used for protection and enhancement of concrete structures (normal and lightweight concrete), especially exposed outdoor concrete surfaces with a risk of cracking.Sikagard®-550 W Elastic is used with concrete repair works as an elastic protective coating on Sika® smoothing mortar (refer to relevant product / system data sheet), fibre cement and overcoating of existing soundly adhering coatings
- Suitable for protection against ingress (Principle 1, method 1.3 of EN 1504-9),
- Suitable for moisture control (Principle 2, method 2.3 of EN 1504-9)
- Suitable for increasing the resistivity (Principle 8, method 8.3 of EN 1504-9)
Advantages
- Crack-bridging even at low temperatures (-20°C)
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water vapour permeable
- Very good resistance against weathering and ageing
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- The system is resistant to aggressive atmospheric influences
Packaging
15 l oval plastic pail
Colour
Thixotropic liquid available in almost every RAL colour shade.
Product Details
APPROVALS / STANDARDS
Complies with the requirements for Class 0, as defined in paragraph A13(b) of approved document B ‘fire safety’ to the Building regulations dated 20.11.2012 Nr 323721 & 323722
EN 1504-2 performance testing, LPM Report A-33’882-2 dated July 09
The product is included in a compilation of tested products and systems as per OS 5a (OS DII) at the German Institute of Road Systems
Determination of dynamic crack bridging properties according to EN 1062-7, report P8690a dated 27/08/2014, Kiwa Polymer Institut GmbH
Chemical Base
Acrylate dispersion
Shelf Life
12 months from date of production if stored properly in undamaged and unopened original sealed packaging.
Storage Conditions
Store in cool and dry conditions. Protect from direct sunlight and frost.
Density
~ 1.39 kg/l (at +20°C)
Solid content by weight
~ 66.1%
Solid content by volume
~ 53.4%
System Structure
| System | Product 1) | Number of applications |
| Priming 2) | Sikagard®-552 W Aquaprimer | 1 |
| Top coat 3) | Sikagard®-550 W Elastic | 2 – 3 |
Tensile Adhesion Strength
| 2,9 (2,8) N/mm² | (EN 1542) |
Crack Bridging Ability
Class A1 (-20°C) - 2 coats | (EN 1062-7) |
| Class B2 (-15°C) - 3 coats |
Freeze Thaw De-Icing Salt Resistance
2,9 (2,1) N/mm² | (EN 13687 part 1 & part 2) |
Behaviour after Artificial Weathering
| Pass after 2000 hours | (EN 1062-11) |
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 x 103 |
| Requirements for breathability | ≤ 5 m |
Capillary Absorption
w = 0,02 kg/(m²h0.5) | (EN 1062-3) |
Permeability to CO2
Dry film thickness | d = 160 µm |
Equivalent air layer thickness | SD, CO2 = 51 m |
Diffusion coefficient CO2 | µCO2 = 3,1 x 105 |
| Requirements for protection | SD, CO2 ≥ 50 m |
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
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 | Waiting time | Next coating |
| Sikagard®-552 W Aquaprimer | 5 hours min. | Sikagard®-550 W Elastic |
| Sikagard®-551 S Elastic Primer | 18 hours min. | Sikagard®-550 W Elastic |
| Sikagard®-550 W Elastic | 8 hours min. | Sikagard®-550 W Elastic |
Curing Treatment
Sikagard®-550 W Elastic does not require any special curing but must be protected from rain for at least 4 hours at +20°C.
Applied Product Ready for Use
Full cure: ~ 7 days at +20°C
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 |
APPLICATION
Apply Sikagard®-551 S Elastic Primer or Sikagard®-552 W AquaPrimer evenly onto the substrate. For use on very dense substrates up to 10% Sika Thinner C may be added to Sikagard®-551 S Elastic Primer.
Sikagard®-550 W Elastic can be applied by brush, roller or airless spray.
CLEANING OF TOOLS
Clean all tools and application equipment with clean water immediately after use.
Hardened / cured material can only be removed mechanically.
For Sikagard®-551 S Elastic Primer use Sika® Thinner C.