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
Usage
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) |
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 Vapor
| 17.9 Perms | (ASTM E-96) |
Diffusion Resistance to Water Vapor
| μ - value H2O (diffusion coefficient) = 3,140 | (at 5 mils. = 120 microns dry film thickness) |
Permeability to CO2
| μ- value CO2 (diffusion coefficient) = 1,100,000 | (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 / Recoat Times
| Between Coats | Rain Resistant After | Final Drying |
| 45 °F (7 °C) approx. 90 min. | approx. 5 hours | approx. 24 hours |
| 68 °F (20 °C) approx. 30 min. | approx. 1 hour | approx. 4 hours |
| 85 °F (30 °C) approx. 20 min. | approx. 40 min. | approx. 3 hours |
Coverage
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.