One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely composed of borosilicate glass, a fabric renowned for its low thermal growth coefficient and chemical inertness. The chemical make-up generally involves silica (SiO₂, fifty-90%), alumina (Al₂O₃... https://diigo.com/0110f1h