Fight against heat islands

Create sunlight adaptive coatings

Every day, our teams develop new, smart, eco-innovative coatings like our CoolKrom® cold paint.

Do you want to limit the heating of one of your products in the sun?
We put our 15 years of expertise in color intelligence at your disposal to create an optimized product together.

Let's innovate together to rethink the materials of our cities

Face à cet enjeu, nos équipes scientifiques sont largement mises à contribution pour innover et développer des revêtements adaptatifs.

Under the combined effect of increasing urbanization and global warming, the heating of our cities is becoming more and more intense. Heat waves and heat waves are recurring more and more frequently and with increasing intensity.

It is illusory to consider the use of air conditioning as the only answer to rising temperatures, both from an energy and environmental point of view. According to a report by the International Energy Agency, the development of air conditioning in emerging countries would cause a doubling of CO2 emissions by 2050.

Faced with this challenge, our scientific teams are being called upon to innovate and develop adaptive coatings.

Materials science in response to climate challenges

Rethink the architecture of an existing product


The phenomenon of urban heat islands requires us to rethink the materials that surround us. Outdoor spaces, especially public spaces, have an important role to play, as do the facades and roofs of buildings.

In the city, solar energy is stored in the materials of buildings and the asphalt of roads or parking lots, and this energy is released into the urban atmosphere at night. The difference in temperature can reach 10°C on a daily basis between the city center and the countryside.

  • To rethink a material, our teams analyze your product and its components to diagnose whether an absorbent coating should be developed to create a dynamic optical barrier or, on the contrary, to limit as much as possible any absorption responsible for thermal heating.

One of our strengths is our multidisciplinary approach, with complementary skills in materials science, photochemistry, photophysics, etc. This know-how enables us to support our industrial partners in their eco-design approach.

Create a dynamic light barrier


To create an optical barrier, the idea is to absorb the sun's energy on the surface to create a natural shadow. This barrier is interactive and intelligent: it captures solar radiation only when the intensity and/or temperature becomes too high.

To create this type of dynamic optical barrier with the sun, we exploit the thermodynamic processes of smart materials that have the ability to modulate their optical response depending on temperature, light... As an exampgle:

  • the thermochromic effect of certain coatings can be used to lighten a color and thus limit the thermal effect generated,
  • photochromic materials can darken a support (plastic, glass, batch...) to create a barrier and protect from the impact of light.

To optimize a coating, our solar simulator allows us to reproduce the thermal impact of the sun and to optimize the constitution of the materials. We study in particular the impact of the coefficients of reflectivity, absorption, emission, then we map with an infrared camera the thermal gain generated.

Limit absorption to optimize thermal impact

Cold surface

If you have a more or less conductive mass product, it is useless to think of creating an optical barrier on its surface to protect it from light. On the contrary, you will absorb solar energy on the surface and by conductivity, create a thermal effect that will heat your material.

To optimize your product, we consider two solutions:

  1. Analyze each component of your product, identify the ingredients to optimize and/or replace to recreate an optimized version of your material
  2. Create a surface coating to limit the absorption of solar radiation as much as possible

Whatever the hypothesis adopted, one of the characteristics to be studied in order to fight effectively against heat islands is the capacity of a material to reflect the sun's rays without storing them: this is the albedo effect. The greater the albedo effect, the less the urban temperature increases, as the heat is immediately sent back to the atmosphere.

To optimize a material, it is a compromise to create between the albedo coefficients and the optical contributions of reflectivity, absorption, emission, thermodynamics, photophysics, materials science ...

Would you like to test our CoolKrom® cold paint?


Our teams of experts have designed a "cold" paint that limits the impact of heat on a building.

On a wall or floor exposed to direct sunlight, our CoolKrom® paint allows the reflection of part of the heat away from the surface, significantly limiting the temperature felt on it.

CoolKrom® paint can be used to cool facades, concrete, floors, asphalt, roofs... It took several years of scientific research to optimize the properties and develop this high-performance white paint.

Particularly interesting in urban areas to reduce heat island effects, CoolKrom® paint is also very useful in rural areas to protect buildings, usually covered with a metal roof and subject to extreme temperatures during hot seasons.

Are you interested in applying our technology? Contact us