One. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are primarily made up of borosilicate glass, a fabric renowned for its lower thermal expansion coefficient and chemical inertness. The chemical make-up usually involves silica (SiO₂, 50-ninety%), alumina (... https://www.geto.space/post/74063_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html