One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are primarily composed of borosilicate glass, a cloth renowned for its minimal thermal enlargement coefficient and chemical inertness. The chemical makeup commonly incorporates silica (SiO₂, 50-90%), alumina... https://omiyou.com/post/168078_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html