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