Sikagard®-550 W IN
Sikagard®-550 W IN is a one part, plasto-elastic coating based on UV-curing acrylic dispersion with excellent crack-bridging and anti-carbonation properties even at low temperatures.
- Crack-bridging even at low temperatures
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water vapour permeable
- Very good resistance against weathering and ageing
- Preventative protection for new reinforced concrete structures exposed to aggressive environments
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- Exhibits good waterproofing characteristics and reduces water penetration
- Suitable coating system for coastal and marine areas (no splash zone)
Usage
- For protection and enhancement of concrete structures (normal and lightweight concrete), especially exposed outdoor concrete surfaces with a risk of cracking
- For concrete repair works as an elastic protective top coating on Sika® repair mortars / thin layer levelling mortar (refer to product data sheet), fibre cement and overcoating of existing sound adhered coatings
Advantages
- Crack-bridging even at low temperatures
- High diffusion resistance against CO2 reducing the rate of carbonation
- Water vapour permeable
- Very good resistance against weathering and ageing
- Preventative protection for new reinforced concrete structures exposed to aggressive environments
- Environmentally friendly (solvent free)
- Reduced tendency to dirt pick up and contamination
- Exhibits good waterproofing characteristics and reduces water penetration
- Suitable coating system for coastal and marine areas (no splash zone)
Packaging
10 kg and 25 kg plastic bucket
Colour
Thixotropic liquid available in various ~RAL shades
IMPORTANT
Dark colour shades may fade more rapidly than other lighter tone colours. This has no influence on the function and performance of the product. Refreshing coat might be required at earlier interval than usual.
IMPORTANT
For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.
IMPORTANT
Slight colour variation is possible between different batches of product. This has no impact of performance of the coating.
Product Details
Product declaration
Confirms to IRC:SP:80
Chemical base
Acrylic polymer (acrylate) dispersion
Shelf life
12 months from date of production
Storage conditions
The Product must be stored properly in original and unopened, sealed and undamaged packaging, in dry conditions at temperatures between +5 °C and +35 °C. Protect from direct sunlight and frost.
Density
| 1.4 ± 0.05 kg/L (at +30 °C) | (EN ISO 2811-1) |
Solid content by weight
~70 %
System structure
| Layer | Product1) | No of coats |
| Primer2) | Sikagard®-552 IN Primer W | 1 |
| Protective coating3) | Sikagard®-550 W IN | 2 |
1) Please refer to the respective product data sheet for additional information.
2) For very difficult substrate (very dense or weak with tensile strength < 1 N/mm2) and at low temperature, use solvent containing primer Sikagard®-551 S Elastic Primer.
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 may also be required in order to achieve the required thickness for full durability (crack bridging, adhesion after thermal cycling, etc.)
Tensile strength
| > 1.5 N/mm2 | (ASTM D638) |
Crack bridging ability
| No failure at 3.2 mm | (ASTM C1305) |
Tensile adhesion strength
| > 1.5 N/mm2 | (ASTM D4541) |
Capillary absorption
| w < 0.1 kg/m2·h0.5 | (EN 1062-3) |
Permeability to water vapour
| Dry film thickness | d = 210 μm |
| Equivalent air layer thickness | SD, H2O = 1.69 m |
| Requirements for breathability | ≤ 5 m |
Permeability to carbon dioxide
| Dry film thickness | d = 210 μm |
| Equivalent air layer thickness | SD, CO2 = 141.6 m |
| Requirements for protection | ≥ 50 m |
Chloride ion diffusion resistance
| Negligible chloride ion penetrability | (ASTM C1202) |
Resistance to UV exposure
| No colour change after 400 hours | (ASTM G53) |
Application
Mixing ratio
The materials are supplied ready for use. Stir thoroughly prior to application.
Layer thickness
200–225 microns in 2 coats (to achieve desired equivalent air thickness for CO2 diffusion and Water vapour diffusion).
Ambient air temperature
+8 °C min. / +40 °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. / +40 °C max.
Waiting time / Overcoating
Waiting time between coats at +20 °C substrate temperature:
| Previous coating | Next coating | Waiting time |
| Sikagard®-551 S Elastic Primer | Sikagard®-550 W IN | 18 hours min. |
| Sikagard®-552 IN Primer W | Sikagard®-550 W IN | 6 hours min. |
| Sikagard®-550 W IN | Sikagard®-550 W IN | 2 hours min. |
Note:
- When application is on existing coatings, the waiting time for both primers will increase by 100 %.
- Refresher coats of Sikagard®-550 W IN can be applied without priming if the existing coat has been thoroughly cleaned.
Applied product ready for use
| ~7 days (full cure) at +20 °C |
Consumption
| Product | Consumption |
| Sikagard®-551 S Elastic Primer | ~0.100–0.150 kg/m2 |
| Sikagard®-552 IN Primer W | ~0.120–0.200 kg/m2 |
| Sikagard®-550 W IN | ~0.200–0.220 kg/m2/coat |
The consumption may vary depending on substrate porosity, temperature and humidity.
APPLICATION
IMPORTANT
Protect the coating from damp, condensation and direct water contact for at least 4 hours.
- Apply Sikagard®-552 IN Primer W or Sikagard®-551 S Elastic Primer evenly onto the substrate. Note: For use on very dense substrates up to 10 % Sika® Thinner C may be added to Sikagard®-551 S Elastic Primer.
- Apply 2 coats by brush, roller or airless spray.
For more details, refer to Sika Method Statement: Sikagard® Protective Coatings.
CURING TREATMENT
Sikagard®-550 W IN does not require any special curing but must be protected from rain for at least 4 hours at +20 °C.
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.