Ever wonder what the chemicals in a roof coating do and whether or not they are important to have in the coating you select? Below we have listed and defined the most common components found in a good acrylic roof coating. These ingredients all contribute to creating a durable, long lasting, waterproofing roof coating that can withstand UV exposure and other outdoor elements.
Acrylic Polymer Resins: These resins are responsible for providing the coating with its most important properties such as water resistance, impact and tear strength, flexibility, adhesion, strength, toughness and overall durability. These resins function as durable binders that hold the coating film together permitting the coating to perform for many years to come.
Titanium Dioxide (TiO2): TiO2 is a pigment that delivers excellent durability and reflectivity. TiO2 is opaque to UV radiation; therefore, it blocks the harmful UV rays from reaching the substrate below, while delivering additional protection and durability to the coating. TiO2 causes the coating to be white in color, increasing reflectivity and energy efficiency in a Cool Roof System.
Zinc Oxide (ZnO): ZnO is pigment that also provides opaqueness to UV radiation, whiteness and reflectivity to a well-formulated acrylic coating. ZnO also resists mildew and algae growth without leaching out of the dried coating film and does not deteriorate by continued exposure to UV rays. This pigment provides additional chemical bonding between polymer molecules, making for a tougher and more water resistant coating.
Fire Retardants: These are also pigments with inorganic materials that suppress smoke generation and flame spread. Fire retardant coatings are required for attaining fire ratings such as UL 790.
Extender Pigments: Extender pigments are essentials. They allow the coating to maintain its quality, primarily affecting the coatings abrasion resistance and color retention.
Dispersants and Surfactants: These are additives that impact the ease and uniformity of how pigments are blended into an acrylic coating. They provide in-can stability so that the coating remains a uniform blend that can be applied consistently and correctly in the field, delivering a water resistant roof coating system.
Defoamers: Defoamers ensure a better performing membrane by minimizing entrapped air in the coating which otherwise would cause areas of weakness in a coating system.
For more information on superior water resistant roof coatings that deliver excellent reflectivity, durability and protection, download our FREE Product Brochure.