Sikagard®-550 W Elastic

• 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

Water-based acrylate dispersion

24 months from date of production.

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.

~1.39 kg/l (at +20 °C)

EN 1504-2: Surface protection product for concrete - Coating

~66.1 %

~53.4 %

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

Sika® levelling / re-profiling mortars or weak concrete with a tensile adhesion strength < 1.0 MPa:

• 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

≥ 2.0 MPa

• Minimum required dry film thickness to achieve anti-carbonation characteristics (CO₂ equivalent air thickness of 50 m) ≈ 160 μm.
  
  For this dry film thickness, approx. 600 g/m² of Sikagard®-550 W Elastic must be applied in total.

• Minimum required dry film thickness to achieve full durability characteristics (CO₂ diffusion, adhesion after thermal cycling and crack bridging) ≈ 340 μm.
  
  For this dry film thickness, approx. 1050 g/m² of Sikagard®-550 W Elastic must be applied in total.

+8 °C min. / +35 °C max.

≤ 80 %

Substrate and ambient temperature must be at least 3 °C above dew point.

+8 °C min. / +35 °C max.

Waiting time between coats at +20 °C substrate temperature:

* When applied on existing coatings, the waiting time will increase by 100 %.

Times are approximate and will be affected by film thickness, changing ambient conditions particularly temperature and relative humidity.

Maintenance coats of Sikagard®-550 W Elastic can be applied without priming if the existing coat has been thoroughly cleaned.

Sikagard®-550 W Elastic does not require any special curing but must be protected from rain for at least 4 hours at +20 °C.

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.

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.

IMPORTANT

On substrates with a rough surface profile, it will be difficult to produce an even coating thickness. This may result in reduced protection and cleanability. Pre-levelling or smoothing the surface is recommended before coating application.

Substrate without existing coating or hydrophobic impregnation

• The substrate must be clean, dry and free of all contaminants such as dirt, oil, grease, surface treatments and loose friable material which can reduce the adhesion of the coating.

• New concrete must be at least 28 days old.

• Prepare the substrate mechanically using suitable equipment such as abrasive blast cleaning or high-pressure water jetting to achieve a textured surface profile suitable for the product thickness and required coating adhesion values.

• Remove weak cementitious substrates

• Fully expose surface defects such as blow holes and voids.

• Prefill surface defects, blowholes, cavities pores etc. using a pore filler (e.g. Sikagard®-545 W Elastofill, Sika MonoTop®-3020, SikaEmaco® N 5100 FC, Sikagard®-720 EpoCem® etc.) to provide a defect free surface.

   

• If Sikagard®-545 W Elastofill or Sikagard®-720 EpoCem® is used, the Product can be applied within 24 hours.

Substrate with existing coating

• Existing coatings must be tested to confirm their adhesion to the substrate and their compatibility. As guidance, in the absence of any national standards or regulations use the following tensile adhesion values: adhesion test average ≥ 0.8 MPa with no single value below 0.5 MPa.

Inadequate adhesion

• Existing coatings must be completely removed and prepared the same as for 'Substrate without existing coating'.

Adequate adhesion

1. Thoroughly clean the existing fully bonded coated surfaces of all contaminants using steam cleaning, low- pressure power washing or high-pressure water jetting equipment.

2. Lightly abrade or grind the surface with mechanical grinding or abrading equipment to achieve a gloss / sheen free surface.

3. Remove dust by industrial vacuuming equipment.

4. For a water-based existing coating, use Sikagard®-552 W Aquaprimer as a primer.

5. For a solvent-based existing coating, use Sikagard®-551 S Elastic Primer as a primer.

6. If the coating type is unknown, carry out compatibility and adhesion testing to determine which primer is most suitable. Wait at least 2 weeks before carrying out tensile adhesion tests.

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

Please 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)

• Confirm product application conditions: substrate moisture content, substrate, air and product temperatures, relative humidity and dew point.

• Make sure the application area is well ventilated during application and drying.

• To prevent air bubbles affecting the finish, do not 'over' brush, roller or spray.

Manual application

1. Apply the Product evenly over the surface with a brush or short pile fleece roller at the required consumption.

2. Control the layer thickness during application using a thickness gauge to achieve the required total dry film thickness.

3. The coating must be continuous, pore free and to the required surface finish.

4. Protect the Product from heavy rain or rain showers until dry to prevent surface damage.

5. Apply additional coats as required.

Airless spray application

IMPORTANT

Do not use aerosol car body type spraying equipment!

1. Spray apply the product in a continuous cross-spray operation and at a speed to achieve a consistent thickness and the required surface finish.

2. Control the layer thickness during application using a thickness gauge.

3. The coating must be continuous, pore free and to the required surface finish.

4. Protect the Product from heavy rain or rain showers until dry to prevent surface damage.

5. Apply additional coats as required.

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.