Solar Heat-Reflective Roofing Granules, Solar Heat-Reflective Shingles and Process for Producing the Same

摘要

A process for preparing roofing granules includes forming kaolin clay into green granules and sintering the green granules at a temperature of at least 900 degrees Celsius to cure the green granules until the crystalline content of the sintered granules is at least ten percent as determined by x-ray diffraction.