One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely made up of borosilicate glass, a fabric renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally includes silica (SiO₂, 50-ninety%), alumina (Al₂O₃,... https://diigo.com/0110f1l