One. Scientific Foundations of Hollow Glass Microspheres one.one Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly composed of borosilicate glass, a fabric renowned for its small thermal expansion coefficient and chemical inertness. The chemical makeup generally includes silica (SiO₂, 50-90%), alumina (Al₂O₃... https://youslade.com/post/348649_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html