Used as an insulating material in high-temperature environments due to its excellent thermal stability and electrical resistance. Commonly found in industrial heaters, furnaces, and electrical equipment where heat resistance is critical. Also used as a release agent in metal casting processes and as a filler in plastics and coatings to improve heat resistance and dimensional stability. In cosmetics, finely ground phlogopite serves as a pearlescent pigment to add shimmer and luster to makeup products. Its inert nature and resistance to chemicals make it suitable for applications in extreme conditions.