Sikagard®-440 HZ

40% alkylalkoxysilane

Active alkylalkoxysilane content > 40% by weight

18 months when properly stored

Store in unopened containers in a clean, dry area between 35 and 110° F (2 and 43° C).

0.20 in (5 mm)

average depth, depending upon substrate

Water weight gain

Absorbed Chloride, % reduction, at 200 ft²/gal (5 m²/L)

Typical drying time for Sikagard®-440 HZ is 4 hours at 70° F (21° C) and 50% relative humidity. Cooler temperatures or higher relative humidity can extend the drying time.

Poured in place and precast concrete: 125–225 ft²/gal (3.1–5.5 m²/L)

Coverage may vary greatly with porosity of the substrate; extremely porous substrates may require 2 coats. Perform test panels to ensure desired results and coverage rates.

For Best Performance

• Do not apply during inclement weather or when inclement weather is anticipated within 12 hours.
• Protect asphalt-based products, such as roofing materials, plastic products, shrubbery, and plant life from overspray.
• Take caution with specially coated glass. Test small areas before application to ensure the product does not discolor the coating.
• To prevent damage to nearby shrubbery and landscaping, cover or protect with drop cloth.
• Paint line striping after the application of the sealer.
• Plastic windows will turn opaque when sprayed with this product.
• Variations in the texture and porosity of the substrate will affect the coverage and performance of the product.
• Sikagard®-440 HZ will not inhibit water penetration through unsound or cracked surfaces, or surfaces with defective flashing, caulking, or structural waterproofing.
• Make certain the most current versions of product data sheet and SDS are being used.
• Proper application is the responsibility of the user. Field visits by Sika personnel are for the purpose of making technical recommendations only and are not for supervising

1. Verify substrate has properly cured. Concrete should obtain 80% of design strength, typically achieved within 14–28 days.
2. Clean all surfaces of all sand, surface dust and dirt, oil, grease, chemical films and coatings, and other contaminants prior to application. Power wash, sandblast, or shotblast as necessary to achieve the desired surface condition.
3. Air, substrate, and material temperatures should be 20° F (-7° C) and rising at the time of the application. The substrate must be frost-free. Do not apply sealer when temperatures are expected to fall below 20° F (-7° C) within 12 hours or when rain is expected within 4 hours following application. Maximum application temperature is 95° F (35° C). May be applied to slightly damp surfaces.
4. Caulking and sealant work may be done before or after the application of the sealer. Allow the sealant to cure fully cured before application of Sikagard®-440 HZ. Following the application, remove the excess product that might pond on a concave sealant joint.

1. Test a small area of the surface (generally a 5 by 5 ft [1.5 by 1.5 m] section) before starting the general application of any clear penetrating sealer to ensure desired performance results, aesthetics, and coverage rates. Allow 5–7 days for the product to fully react before evaluation. Contact Technical Service for details.
2. Stir material thoroughly before and during application.
3. Apply to saturation using low-pressure non-atomizing spray or pouring, followed by a squeegee or a broom for even distribution.

Clean equipment with xylene or SikaSwell®-990.