Roofing granule as a kind of Reflective granules, it mainly refers to various granular substances used in roof materials, which can be natural or synthetic. Common roofing granule include perlite, expanded perlite, polystyrene particles, etc. These particles have the characteristics of light weight, heat insulation, sound absorption, etc., which can effectively improve the thermal insulation performance of the roof and reduce the energy consumption of the building.