One. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly composed of borosilicate glass, a material renowned for its very low thermal enlargement coefficient and chemical inertness. The chemical makeup ordinarily consists of silica (SiO₂, 50-90%), alumina... https://webyourself.eu/posts/1604926