Sikagard®-550 W Elastic (G)
CRACK BRIDGING AND ANTI-CARBONATION PROTECTIVE COATING FOR CONCRETE
Sikagard®-550 W Elastic (G) is a one component, plasto-elastic coating based on acrylic dispersion with excellent crack-bridging properties. It has excellent resistance against carbonation and ingress of chloride ions, sulphates and oxygen. Suitable for use in hot and tropical climatic conditions.
- Crack-bridging
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water resistive and vapour permeable
- Very good resistance against chlorides, weathering and ageing
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- Excellent properties / reaction to fire: Class A according to ASTM E84-16
Usage
- Sikagard®-550 W Elastic (G) 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 (G) is used with concrete repair works as an elastic protective coating on Sika® smoothing mortars (SikaRep®, Sika Monotop® range), fibre cement and overcoating of existing soundly adhering coatings.
- Can be applied on various substrates such as bricks, masonry, concrete blocks, and metal elements such as aluminum sections.
- Damp proof coating on facades for high rise and low rise residential, commercial, institutional buildings, etc.
- Vapor control layer for facade application.
- Comprehensive barrier against carbon dioxide, water, sulphates and chloride ions.
- Bridge, highway structures and underpasses.
- Multi storey car parks and underground garages.
Advantages
- Crack-bridging
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water resistive and vapour permeable
- Very good resistance against chlorides, weathering and ageing
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- Excellent properties / reaction to fire: Class A according to ASTM E84-16
Packaging
20 kg pail
Colour
Thixotropic liquid, available in standard RAL colours:
Signal Yellow: RAL 1003, Sky Blue: RAL 5015, Traffic Green: RAL 6024, Light Grey: RAL 7035, Window Grey: RAL 7040 and Pure White: RAL 9010.
Other RAL colours subject to minimum product order.
Product Details
SUSTAINABILITY
Sikagard®-550 W Elastic (G) is certified according "Low Emitting Materials as per Al Sa'fat - Dubai Green Building Evaluation System" by Dubai Central Laboratory (DCL) certificate No. CL17020432.
CERTIFICATES AND TEST REPORTS
- Applus Laboratories Report No. 15/10467-1097-S for crack bridging, classified as Class A4 and Class B.3.1 according to UNE-EN 1062-7:2004 Methods A - C.2 and B - B.3.1
- Sikagard®-550 W Elastic (G) follows the main requirements of EN 1504-2 as a protective coating.
Composition
Acrylate dispersion
Shelf life
12 months from date of production
Storage conditions
Store in cool, dry conditions in original, undamaged sealed packaging and at temperatures between +5°C and +30°C. Protect from direct sunlight, heat and moisture.
Density
~1.34 kg/l (20°C)
Solid content by mass
~62 %
Solid content by volume
~46 %
Viscosity
~1200 Cps (25°C)
Volatile organic compound (VOC) content
The maximum content of Sikagard®-550 W Elastic (G) is < 40 g/l VOC for the ready to use product.
System structure
| System | Product (1) | Number of applications |
| Priming (2) | Sikagard®-552 W Aquaprimer (G) | 1 |
| Priming (optional) | Sikagard®-550 W Elastic (G) diluted with 20 - 25% water | 1 |
| Priming (optional) | Sikagard®-700 S | 1 |
| Top coat (3) | Sikagard®-550 W Elastic (G) | 2 - 3 |
Note (1) Please refer to the respective data sheet for additional information.
Note (2) For very difficult substrate (very dense or weak with tensile strength < 1 N/mm2) and/or the use of hydrophobic primer Sikagard®-700 S.
Note (3) In case of an intensive yellow or red colour shade and/or a dark substrate, more than two coats might be required.
A third coat is also required in order to achieve the required DFT thickness for full durability (crack bridging, adhesion after thermal cycling, etc.)
Crack bridging ability
| Class A 4 (> 1.25 mm) | (UNE-EN 1062-7:2004 Method A - C.2) |
| Class B.3.1 | (UNE-EN 1062-7:2004 Method B - B.3.1) |
Tensile adhesion strength
| ≥ 1,5 N/mm2 (or concrete failure) | (ASTM D4541) |
Water absorption
| Result | Requirements |
| W = 0.024 kg/(m2h0.5) | W < 0.1 kg/(m2h0.5) |
Permeability to carbon dioxide
| Test | Result | Requirements |
| Diffusion equivalent air layer thickness (Sd) | >100 m | >50 m |
Note: Applied dry film thickness (DFT) ~200 μm
Chloride ion diffusion resistance
| < 1000 coulombs Classification: Very Low RCP | (ASTM C1202) |
Behaviour after artificial weathering
| No cracking, no chalking, no flaking, no wrinkling, no blistering, or any other type of failure. | (ASTM G154-16) |
Reaction to fire
| lab result | Class A - requirements | |
| Flame Spread Index (FSI) | 15 | 0 - 25 |
| Smoke Development Index (SDI) | 0 | 0 - 450 |
Application
Layer thickness
Recommended minimum dry film thickness to achieve the required characteristics ≈200 microns.
Ambient air temperature
+8°C min. / +40°C max.
Relative air humidity
< 80 %
Dew point
Temperature must be at least 3°C above dew point.
Substrate temperature
+8°C min. / +40°C max.
Waiting time to overcoating
Waiting time between coats at +23°C substrate temperature:
| Previous coating | Minimum waiting time | Next coating |
| Sikagard®-552 W Aquaprimer (G) | 5 h | Sikagard®-550 W Elastic (G) |
| Sikagard®-700 S | 24 h | Sikagard®-550 W Elastic (G) |
| Sikagard®-550 W Elastic (G) | 8 h | Sikagard®-550 W Elastic (G) |
Note: When application is on existing coatings, the waiting time for both primers will increase by 100 %.
Refresher coats of Sikagard®-550 W Elastic (G) can be applied without priming if the existing coat has been thoroughly cleaned.
*Sikagard®-Putty can be used only as a pore sealing putty for minor defects and filling of pinholles. It should not be used as surface leveling layer.
*Contact Sika's Technical Department if surface leveling is required.
Consumption
| Product | Per coat |
| Sikagard®-552 W Aquaprimer (G) | ~0.10 - 0.15 kg/m2 |
| Sikagard®-700 S | ~0.15 - 0.30 kg/m2 |
| Sikagard®-550 W Elastic (G) | ~0.25 - 0.35 kg/m2 |
Some substrates will require higher consumption than indicated above. This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level and wastage etc..
APPLICATION
Apply Sikagard®-700 S or Sikagard®-552 W Aquaprimer (G) evenly onto the substrate.
Sikagard®-550 W Elastic (G) can be applied by brush, roller or airless spray.
CURING TREATMENT
Sikagard®-550 W Elastic (G) does not require any special curing but must be protected from rain for at least 4 hours at +23 °C.
Full cure: ~7 days at +23 °C
CLEANING OF EQUIPMENT
Clean all tools and application equipment with clean water immediately after use. Hardened / cured material can only be removed mechanically.
For Sikagard®-700 S use Colma Cleaner.