Expancel is a powerful ally in both roof coatings and in wall coatings. The microspheres are optimal for developing highly flexible exterior coatings and cool roof coatings used on concrete and similar materials.

Solar reflectance in cool roof coatings

Compare Expancel Microspheres with other fillers commonly used in cool roof coatings. You'll find that most of them are not only heavier, but also offer less protection from the sun. That´s because our microspheres are packed with powers that include high solar reflecting and thermal insulating properties. Expancel's proven track record for reflecting visible and near-infrared light, and its resilient nature, makes it a perfect ingredient for formulating an elastomeric cool roof coating with superior quality.

In warm climates, air conditioning takes the lion's share of total energy consumption, with percentages around the 70 mark in residential areas. Our tiny microspheres make it possible to reduce this number by minimizing the need for turning up the AC when it's hot. Elastomeric cool roof coatings with Expancel can bring down the external surface temperature of a building by as much as 15°C/27°F*. Not only does it help keep things cool inside, it also makes relying on energy-draining air conditioning a whole lot less.

*number may vary depending on intensity of solar radiation and roof type.

The science speaks for itself. A comparison was done between a commercial cool roof coating with TiO2 and one cool roof coating formulated with Expancel Microspheres and less TiO2. It's quite clear which one performed better with spectral reflectance.

Elasticity in wall and roof coatings

When compared to Expancel, mineral fillers are heavier and have a higher specific surface area which requires more binder. The spherical particles of our microspheres require less binder. This, in turn, leaves the coating to maintain its elasticity, acting as an impenetrable barrier that protects against cracks. All the while, the coating is able to breathe. The elasticity of elastomeric coatings filled with Expancel has proven to be more superior when compared to other alternatives – even when tested in severe weather conditions. This together with the closed cell structured microspheres makes Expancel the ideal addition in water proofing coatings.

Its flexibility also allows you to up the PVC without jeopardizing the coating's elasticity. Plus, the microspheres take to resin nicely.

Watch the videos below to see the elasticity of Expancel Microspheres in coatings.

Elasticity of Expancel Microspheres in coatings

Download paper on microspheres in cool roof coatings

The best Expancel products for elastomeric cool roof coatings

Product groups Characteristics Main applications
Expancel WE Wet. Expanded Solid content of about 15%, used in waterborne products. Great for paint and crack fillers, reflective coatings, leather finishing and more.
Expancel DE Dry. Expanded Used in products where no water can be added. Great for polyester putty, cultured marble, model-making board and more.

Related application

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Related case story using Expancel Microspheres