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 composed of borosilicate glass, a material renowned for its reduced thermal enlargement coefficient and chemical inertness. The chemical make-up generally features silica (SiO₂, 50-ninety%), alumina ... https://www.speakfreelee.com/post/78605_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html