One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a fabric renowned for its lower thermal expansion coefficient and chemical inertness. The chemical make-up commonly features silica (SiO₂, 50-ninety%), alumina (Al... https://www.jointcorners.com/post/483698_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html