Sikagard®-520 W
Sikagard®-520 W is a one component, plasto-elastic coating based on acrylic dispersion with crack-bridging properties. It has good resistance against carbonation and ingress of chloride ions, sulphates and oxygen. Suitable for use in hot and tropical climatic conditions.
- Water resistive, and vapour permeable
- Crack-bridging
- Good resistance against weathering and ageing
- Solvent free
- Reduced tendency to dirt pick up and contamination
Usage
- Sikagard®-520 W is used as decorative coating for interior and exterior surfaces.
- Sikagard®-520 W can be applied on various substrates such as cement plaster, bricks, masonary and concrete blocks, rendered surfaces and concrete surfaces.
- Sikagard®-520 W is used as a dampproof coating for facades.
- Sikagard®-520 W is used for protection and enhancement of concrete structures (normal and lightweight concrete).
Advantages
- Water resistive, and vapour permeable
- Crack-bridging
- Good resistance against weathering and ageing
- Solvent free
- Reduced tendency to dirt pick up and contamination
Packaging
20 kg pail
Colour
Coloured liquid, available in many colours. Please refer to Sika's Colour chart.
Product Details
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 +35 °C. Protect from direct sunlight, heat and moisture.
Density
~1.22 kg/l (25 °C)
Solid content by weight
~50 %
Solid content by volume
~41 %
Volatile organic compound (VOC) content
The maximum content of Sikagard®-520 W is < 20 g/l VOC for the ready to use product.
System Structure
| System | Product (1) | Number of applications (consumption) |
| Priming (optional) (2) | Sikagard®-552 W Aquaprimer (G) | 1 - 2 (~100g/m2) |
| Filler/Putty/Scratch Coat (optional) | SikaWall® or Sikagard® range | As per substrate requirements |
| Top coat (3) | Sikagard®-520 W | 2 - 3 (~100 g/m2/coat) |
Note (1) Please refer to the respective data sheet for additional information.
Note (2) For very difficult substrate (very dense or weak tensile adhesion strength / pull off < 1 N/mm2), primer application is recommended.
Note (3) In case of an intensive yellow or red colour shade and/or a dark substrate, more than two coats might be required.
Tensile Strength
| > 1,0 N/mm2 (at 23°C) | (ASTM D638) |
Tensile Adhesion Strength
| ≥ 1,5 N/mm2 (or concrete failure) | (ASTM C1583) |
Crack Bridging Ability
| Class A 4 (> 1.25 mm) | (EN 1062-7:2004, Method A - C.2) |
Water Absorption
| Result | Requirements |
| ~3 mm | < 10 mm |
Application
Layer Thickness
Recommended minimum dry film thickness to achieve the required characteristics ≈100 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.
Curing Treatment
Sikagard®-520 W does not require any special curing but must be protected from rain for at least 4 hours at +23 °C.
Full cure: ~7 d at +23 °C
Consumption
| Product | Per coat |
| Sikagard®-520 W | ~0.10 - 0.20 kg/m2 |
Note:
- 300 g of coating applied over 1 m2 will give approx. 100 µm dry film thickness
- 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
Depending of substrate porosity and required pull-off strength, apply Sikagard®-552 W Aquaprimer (G) evenly onto the substrate.
Apply leveling putty from SikaWall® or Sikagard® range with spatula or trowel, for rectifying minor surface defects, mechanically damaged areas and hairline cracks. When harden, dry sandpaper may be used for smoothening of the surface if required.
Sikagard®-520 W can be applied by brush, roller or airless spray, in one or two coats.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with clean water immediately after use. Hardened / cured material can only be removed mechanically.