1. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely composed of borosilicate glass, a material renowned for its minimal thermal growth coefficient and chemical inertness. The chemical makeup ordinarily features silica (SiO₂, 50-90%), alumina (Al₂O... https://www.bib.az/post/229332_elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html