One. Scientific Foundations of Hollow Glass Microspheres one.one Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are principally composed of borosilicate glass, a fabric renowned for its low thermal growth coefficient and chemical inertness. The chemical make-up normally includes silica (SiO₂, 50-ninety%), alumina ... https://www.speakfreelee.com/post/78606_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html