Sikagard®-670 W

Water dispersed, acrylic, protective, anti-carbonation coating

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Sikagard®-670 W is a water dispersed colored, acrylic, protective coating. Sikagard®-670 W prevents moisture ingress, is water vapor permeable and provides an excellent carbonation barrier.

  • Easy to apply
  • Extremely resistant to dirt pick-up and mildew
  • Excellent resistance to carbon dioxide and other aggressive gas diffusion
  • Excellent UV resistance
  • Excellent weathering resistance
  • Prevents ingress of chlorides
  • Cost effective protection
  • Vapor permeable; allows each way water vapor diffusion (breathable)
  • High Reflectance Value
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Overview

Areas of Application

Above grade, exterior application on buildings or civil engineering structures. It is designed to aesthetically enhance, protect and add superior light reflectance to concrete and other masonry substrates subject to normal hydrothermal movement.  

Advantages

  • Easy to apply
  • Extremely resistant to dirt pick-up and mildew
  • Excellent resistance to carbon dioxide and other aggressive gas diffusion
  • Excellent UV resistance
  • Excellent weathering resistance
  • Prevents ingress of chlorides
  • Cost effective protection
  • Vapor permeable; allows each way water vapor diffusion (breathable)
  • High Reflectance Value

Packaging

5 gal. (19 L), re-closable plastic pails

Color

463 standard colors. Custom color-matching available

Product Details

Shelf life

12 months in original, unopened container

Storage conditions

Store dry at 40–95 °F (4–35 °C). Condition material to 60–75 °F (15–24 °C) before using.  Protect from freezing. If frozen, discard

Solid content by weight

60 %

Solid content by volume

46 %

Reaction to fire

Flame Spread: 0

Smoke Development: 5

Class Rating: A

Flame Spread and Smoke Development

(ASTM E-84-94)

Resistance to UV exposure

91 %

Light Reflectance Value

(ASTM E-1164)

Resistance to weathering

Excellent, no chalking or cracking (2000 hours)

(ASTM G-26)

Permeability to water vapour

17.9 Perms

(ASTM E-96)

Diffusion resistance to water vapour

μ - value H2O (diffusion coefficient) = 3,140
SdH2O (equivalent air thickness) = 1.3 ft. (0.4 m)

(at 5 mils. = 120 microns dry film thickness)

Permeability to carbon dioxide

μ- value CO2 (diffusion coefficient) = 1,100,000
SdCO2 (equivalent air thickness) = 433 ft. (132 m)
Equivalent concrete thickness (Sc) = approximately 13 in. (33 cm)

(at 5 mils. = 120 microns dry film thickness)

Application

Pot Life

Indefinite, provided proper care is taken in protecting the system from moisture, freezing, contamination, or evaporation.

Waiting time to overcoating

Between Coats

Rain Resistant AfterFinal Drying

45 °F (7 °C)

approx. 90 min.

approx. 5 hoursapprox. 24 hours

68 °F (20 °C)

approx. 30 min.

approx. 1 hourapprox. 4 hours

85 °F (30 °C)

approx. 20 min.

approx. 40 min.approx. 3 hours

Consumption

Theoretical per coat: 300 ft2/gal. Wet film thickness: 5 mils. Dry film thickness: 2.5 mils. Normal coating system is two coats minimum at a total nominal dry film thickness of 5 mils.

  

Consumption is obviously dependent on substrate. In addition, allowance must be made for surface profile, variations in applied film thickness, loss and waste. A third coat may be necessary where opacity is reduced through thinning of the first coat, on dense substrates or with very bright color shades.

APPLICATION

Mixing

Stir thoroughly to ensure uniformity using a low speed (400-600 rpm) drill and Sika paddle. To minimize color variation when using multiple batches, blend two batches of Sikagard®-670 W. Use one pail and maintain the second pail to repeat this procedure (boxing) for the entire application.

  

Any areas of glass or other surfaces should be masked. Recommended application temperatures (ambient and substrate) 45–95 °F (5–35 °C). Sikagard®-670 W can be applied by brush, roller, or spray over entire area moving in one direction. Allow a minimum of 20-90 minutes prior to re-coating. At lower temperatures and high humidity, waiting time will be prolonged. At higher temperatures, work carefully to maintain a ‘wet’ edge. Sikagard®-670 W is usually applied using a short nap lambs wool roller. Sikagard®-670 W is particularly suitable for application by spray using the most standard spray painting equipment. As with all coatings, jobsite mock-ups should always be completed to confirm acceptability of workmanship and material.

  

Note: To achieve a dry film thickness of 4-6 mils. (0.1–0.15 mm)., two uniform coats should be anticipated. On porous substrates, a third coat may be necessary and on particularly dense substrates, the first coat should be thinned 10 % by volume with water. A third coat may then be needed for opacity.