One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are primarily made up of borosilicate glass, a cloth renowned for its very low thermal expansion coefficient and chemical inertness. The chemical make-up usually features silica (SiO₂, 50-90%), alumina (Al... https://socialcreditu.com/post/9646_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html