Hollow glass microspheres are lightweight, spherical particles with a smooth, reflective surface. Composed primarily of alkali-lime borosilicate glass, they offer a unique combination of properties including low density, high strength, low thermal conductivity, excellent electrical insulation, temperature resistance, chemical stability, and fluidity. These versatile microspheres are widely used in adhesives, corrosion-resistant and insulating coatings, construction materials, rubber, synthetic wood, oilfield cements, and lightweight automotive composites.