1. Scientific Foundations Of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly composed of borosilicate glass, a cloth renowned for its small thermal growth coefficient and chemical inertness. The chemical makeup typically consists of silica (SiO₂, fifty-90%), alumina (Al₂O₃, ... https://www.friend007.com/post/560890_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html