One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a material renowned for its low thermal growth coefficient and chemical inertness. The chemical make-up ordinarily features silica (SiO₂, 50-90%), alumina (Al₂O₃, te... https://gaming-walker.com/post/139858_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html