Elastomeric cool roof coatings

Self-cleaning with superior performance

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The use of cool roof coatings with high solar reflecting properties is becoming more and more popular to reduce the need for air conditioning

Our Expancel® microspheres are packed with powers that include high solar reflecting and thermal insulating properties and their proven track record for reflecting visible and near-infrared light makes them perfect for use in elastomeric cool roof coating formulations.

In addition, the elasticity of elastomeric coatings with Expancel® microspheres as a filler has proven to be superior when compared to other alternatives – even when tested in severe weather conditions. This together with the closed-cell structured microspheres makes Expancel® microspheres the ideal addition to waterproofing coatings.

Graf showing solar energy distribution on a surface over a wavelength range from 250 nm (UV) to 2250 nm (NIR). Comparing spectral reflectance of coating using TiO2, CaCO3 or Expancel® Microspheres (WE) as binder. Using Expancel® shows the highest and widest range of solar reflection for the coating.

To keep the cooling power, a cool roof coating must stay clean. This is where our Levasil® CC products that enhance the anti-soiling properties have a key role to play

Elastomeric cool roof coatings are prone to dirt pick-up due to their tacky nature. Anti-soiling or DPUR (dirt pick-up resistance) is therefore a key parameter to be able to utilize the high solar reflecting properties of the cool roof coating. A simple solution is to add Levasil® CC, our silane-modified colloidal silica, which significantly enhances the DPUR properties of the paint by reducing the tackiness.

It is also important that the coating firmly adheres to the substrate and expands and contracts with it upon temperature changes in order to also seal and waterproof the roof. The addition of colloidal silica improves adherence and mechanical properties of the coating without sacrificing coating elasticity and flexibility.

15-minute technical seminar 

At the latest European Coatings Show, Dr Jan Nordin, Senior Application Engineer, Expancel and Dr Peter Greenwood, Technical Development Manager, Levasil® colloidal silica explained how the performance of elastomeric cool roof coatings can be enhanced by combining Expancel® microspheres and Levasil® products in the paint formulation.

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Featured products

Expancel microspheres

Expancel 921 WE 40 d24

Wet, expanded thermoplastic microspheres used as a lightweight filler in coatings, porous ceramics and similar applications. It has a particle size of around 40 µm.

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Levasil colloidal silica

Levasil CC301

Levasil® CC301 is a neutral, aqueous dispersion of colloidal silica that is approximately 30% solids by weight. The silica dispersion is sterically stabilized and the amorphous silica particles carry a negative surface charge. The silica particles are discrete, have a smooth, spherical shape, and are present in a narrow particle size distribution. The particles have also been surface modified with an epoxy silane. “Hydroxyl number” for 2-pack systems; 0.45 mole OH/kg product. The physical appearance of the dispersion is a clear liquid, slightly more viscous than water. Levasil® CC301 is produced for world-wide distribution.

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Related case stories and articles

PCI magazine July 2020 

Self-cleaning elastomeric cool roof coatings

Featured applications for paints and coatings

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Expancel® is a registered trademark of Nouryon in a number of territories worldwide.

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