ACRONAL® 4250 is an aqueous acrylate copolymer dispersion with room temperature crosslinking for use in flexible coating compounds. Such coatings may be used for sealing of concrete roofs and the protection of polyurethane insulation foam, rolled roofing, or asphalt roof systems against the effects of weathering. For areas where permanent water loading is anticipated or the slope is <2°, this material is not recommended.

This pure acrylic polymer dispersion is designed for high flexibility at low temperatures. The glass transition temperature of minus 28°C (DSC midpoint) makes it ideally suitable for designing mixtures that need to meet ASTM D 6083-05 requirements.

ACRONAL 4250 was developed to give excellent adhesion to polyurethane roofing foam and many other substrates. In addition, it contains crosslinking agents that crosslink the polymer film after the water has evaporated. This crosslinking occurs both on the surface and through the coating to give good elastic film properties with only a slightly tacky surface. This helps in the resistance of the film to pick up dirt and retain good reflectivity.

For more information on this product, check out the brochure!

Features & Benefits

• Zine free capable
• Excellent elongation strength with weathering
• Good dirt pick-up resistance
• Great water resistance
• Ammonia and APEO free

Performance Data

Properties