One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a material renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally involves silica (SiO₂, fifty-90%), alumina (Al₂O... https://vherso.com/post/570519_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html