One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.1.one 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 involves silica (SiO₂, fifty-90%), alumina ... https://www.jointcorners.com/post/483682_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html