One. Scientific Foundations of Hollow Glass Microspheres one.one Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its very low thermal expansion coefficient and chemical inertness. The chemical make-up normally includes silica (SiO₂, 50-ninety%), alum... https://www.malikmobile.com/story/194004-elementary-substance-is-a-pure-chemical-substance-that-consists-of-atoms-belongi.html