Product Data Sheet Show all documents

Sikagard®-680 MY

High performance methyl metacrylate (MMA) compositions for protection and decoration on concrete, masonry and steel structure

Sikagard®-680 MY is a one-part solvent containing coating, based on methacrylic resins resistant to weathering, alkalis and ageing. It is available in clear and coloured grades for use on mineral substrates including concrete and other cementitious surfaces. Sikagard®-680 MY protects concrete against aggressive atmospheric influences and promotes a self-cleaning effect on the treated surfaces. It does not adversely influence the characteristic texture of the concrete.

  • Provides excellent weather resistance and is based on a methacrylic resin with fast evaporating solvents
  • Protects the concrete against aggressive atmospheric influences, which can penetrate into the concrete in the form of salts or gases
  • Very high diffusion resistance against carbon dioxide and, therefore reduces considerably the rate and depth of carbonation of the concrete
  • Water vapour permeability is not adversely affected
  • Excellent resistance to dirt pick-up
  • Highly UV-resistant MMA gives exceptional resistance to effects of long-term weathering
Product Data Sheet Show all documents

Usage

  • Protection and enhancement of concrete and other cementitious materials on building and infrastructures elements.
  • Sikagard®-680 MY clear glaze:
    Colourless material drying to a glossy coat, suitable as refresher and protective coating for exposed aggregate concrete.
 
  • Sikagard®-680 MY top coat:
    Top coating, drying to a matte finish, available in a large number of decorative standard and almost unlimited special colour shades.

Advantages

  • Provides excellent weather resistance and is based on a methacrylic resin with fast evaporating solvents
  • Protects the concrete against aggressive atmospheric influences, which can penetrate into the concrete in the form of salts or gases
  • Very high diffusion resistance against carbon dioxide and, therefore reduces considerably the rate and depth of carbonation of the concrete
  • Water vapour permeability is not adversely affected
  • Excellent resistance to dirt pick-up
  • Highly UV-resistant MMA gives exceptional resistance to effects of long-term weathering

Packaging

20 litre/pail

Colour

Clear Glaze: clear liquid
Standard colours include:
Pebble Grey (~RAL 7032), Light grey (~RAL 7035) and White (~RAL 9010)

Non-Standard colours are also available upon request.

Product Details

Product Information

Composition

Acrylate resin in solvent

Shelf life

2 years from date of production

Storage conditions

Store properly in original, unopened and undamaged sealed packaging in cool and dry conditions. Protect from direct sunlight and frost.

Flash Point

Above 35°C

Solid content by volume

~43 % dependence on colour
System information

System Structure

Sikagard®-680 MY clear glaze

As protection and enhancement of exposed aggregate concrete

2 x Sikagard®-680 MY clear glaze

Sikagard®-680 MY top coat

In normal situation

2 x Sikagard®-680 MY top coat

When using bright yellow and red colour shades

3 x Sikagard®-680 MY top coat

When combined with hydrophobic impregnation priming coats

1–2 x Sikagard®-700 S or Sikagard®-700 MY
2 x Sikagard®-680 MY top coat
Technical Information

Freeze Thaw De-Icing Salt Resistance

Unaffected by 50 exposure cycles (no scaling effect)

(ASTM C672-12)

Water Absorption

Reduction in water absorption > 80 % at 28 days

(ASTM C642-13)

Chloride Ion Diffusion Resistance

> 90 % at 28 days

(ASTM C1556-11a)

Permeability to Carbon Dioxide

> 250 m equivalent thickness of air

(BS EN 1062-6:2002, Method B)

Application

Application Information

Relative Air Humidity

< 85 %

Dew Point

Beware of condensation! Substrate temperature must be at least 3 °C above dew point

Substrate Temperature

+5°C min. / +35°C max.

At rising temperature do not apply to concrete substrates without pore sealer.

Waiting Time / Overcoating

Substrate temperature

Time

+10°C

8 hours

+20°C

5 hours

+30°C

3 hours

Note: Refresher coats of Sikagard®-680 MY can be applied without priming if the existing coating has been thoroughly cleaned.

Applied Product Ready for Use

~5 days at +20°C
Consumption

Consumption

Sikagard®-680 MY clear glaze

~0.15 kg/m² per coat

Sikagard®-680 MY top coat

~0.20 kg/m² per coat
Application steps

APPLICATION

Stir thoroughly prior to application. In difficult painting conditions such as very low or very high temperatures, up to 5% of Sika® Thinner-C can be added.

For use on very dense substrates, the first coat of Sikagard®-680 MY shall be tinned with up to 10% Sika® Thinner-C.

Sikagard®-680 MY can be applied by brush or shortpiled lambskin roller.

The top coat can also be applied by airless spray. Thinning with Sika® Thinner-C up to 7% max., is allowed. Spray pressure 150-160 bars, nozzle bore 0.38-0.66 mm, and spray angle 50-80°.

CURING TREATMENT

Sikagard®-680 MY does not require any special curing but must be protected from rain for at least 1 hour at +20°C (dust dry in 30 minutes at +20°C).

CLEANING OF EQUIPMENT

Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened or cured material can only be removed mechanically.

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