FEATURE
chemicals and are typically formulated as water-dispersible products. The type of polymer or chemical used determines the additive’ s performance characteristics.
Based on composition, additives can be categorized as follows: 1. Acrylonitrile Butadiene Rubber( NBR) Additives Widely used for rubberizing refined tar, asphalt, and petroleum-based sealcoatings, improving flexibility and toughness. They also offer excellent resistance to chemicals, oils, greases, hydraulic fluids, and kerosene. 2. Acrylic Polymer and Copolymer Additives Commonly used for thickening, sand / aggregate suspension, and faster drying. 3. Styrene Butadiene, Natural Rubber, and Butyl Rubber Additives Used for thickening, aggregate suspension, faster drying, and improved chemical resistance. These polymers offer strong resistance to water, moderate chemicals, alcohols, and organic acids. 4. Polyvinyl Acetate / Acrylic Copolymer Additives Often used for thickening and drying performance. However, they typically have poor resistance to water, UV exposure, salts, fuels, and oils, which limits their effectiveness as overall performance enhancers. 5. Alcohol-Based Additives Designed to enhance drying properties, allowing sealcoatings to cure more effectively in cooler conditions. These improve color, durability, and performance but do not affect viscosity.
Cautions
• Additives must always be selected and used according to the manufacturer’ s recommendations. A common misconception is that additives can be used universally across all sealcoatings— this is not the case. Most are formulated for specific sealer types and may be incompatible with others, potentially degrading performance. Always consult the manufacturer for compatibility and usage guidance.
• Additives will not compensate for poor mix design, such as substandard sealer, excessive water, or improper aggregate ratios. Always follow supplier recommendations.
• Do not mix additives from different manufacturers within the same sealcoating system. Even if they serve similar functions, their chemical compositions may differ and can negatively impact performance or void warranties.
• Follow recommended dosage levels carefully. Too little additive may yield no benefit, while too much can waste money or even degrade performance. For example, excessive thickener can make the sealer too viscous to mix or apply.
Final Thoughts
Although used in small quantities, additives can be a powerful tool— often making the difference between a good job and a great one. For contractors, this can lead to increased customer satisfaction and business growth. For property owners, it can mean longer-lasting pavement and reduced maintenance costs. It’ s a win-win for everyone.
Nihal Pandrapragada is a Technical Manager and Research & Develoment Chemist with STAR SEAL, Inc.
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