One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally composed of borosilicate glass, a cloth renowned for its minimal thermal enlargement coefficient and chemical inertness. The chemical makeup commonly contains silica (SiO₂, fifty-ninety%), al... https://sites.google.com/view/boridepowder/%E9%A6%96%E9%A1%B5?read_current=1