Materials that have high reflectivity and low thermal conductivity tend to stay cool in the Sun. Here are a few examples of materials that exhibit these properties:
Reflective Roofing Materials: Certain types of roofing materials, such as white or light-colored metal roofs, reflective roof coatings, or specially designed cool roof materials, have high solar reflectance. They reflect a significant amount of sunlight, reducing heat absorption and keeping the surface and the interior of the building cooler.
Ceramic or Clay Tiles: Ceramic or clay tiles have a low thermal conductivity, which means they do not readily transfer heat. They can provide some insulation and keep the surface cooler than materials with higher thermal conductivity.
Natural Stone: Some types of natural stone, such as light-colored granites or light-colored limestone, have relatively high reflectivity and low thermal conductivity. These properties help them stay cooler under sunlight compared to darker or more heat-absorbing materials.
Cool Pavement Materials: Certain pavement materials, like light-colored concrete, asphalt with reflective coatings, or permeable pavements with high solar reflectance, can stay cooler by reflecting more sunlight and reducing heat absorption.
Insulating Materials: Insulation materials, such as expanded polystyrene (EPS) foam or reflective insulation, have low thermal conductivity and can help keep surfaces cooler by limiting heat transfer.
It's important to note that no material can stay completely cool in the Sun as all materials will absorb some amount of heat. However, materials with high reflectivity and low thermal conductivity can minimize heat absorption and keep surfaces relatively cooler.