One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely composed of borosilicate glass, a fabric renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up usually includes silica (SiO₂, 50-90%), alumina (Al₂O₃, ten... https://www.vevioz.com/post/1845441_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html