1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly composed of borosilicate glass, a material renowned for its reduced thermal growth coefficient and chemical inertness. The chemical makeup typically contains silica (SiO₂, fifty-90%), alumina (Al₂O₃... https://diigo.com/0110f1h