One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.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%), alumin... https://www.bib.az/post/229333_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html